Relation Results

Identifier	Residue	Sequence	Organism
SIGNOR-272110	Lys492	YMSEHLLkAGANITP	in vitro
pmid	sentence
23455478	Here, we identify PLK1 as a target of the cullin 3 (CUL3)-based E3 ubiquitin ligase, containing the BTB adaptor KLHL22, which regulates chromosome alignment and PLK1 kinetochore localization but not PLK1 stability. In the absence of KLHL22, PLK1 accumulates on kinetochores, resulting in activation of the spindle assembly checkpoint (SAC). CUL3-KLHL22 ubiquitylates Lys 492, located within the PBD, leading to PLK1 dissociation from kinetochore phosphoreceptors.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265970	Ser102	KHFYRKPsPQAEEML	Homo sapiens	HeLa Cell
pmid	sentence
31118282	Purified Plk1 bound to p31comet and phosphorylated it, resulting in the suppression of its activity (with TRIP13) to disassemble checkpoint complexes. We conclude that Plk1 phosphorylates p31 on S102 and on five additional sites. The phosphorylation of the additional sites was possibly not detectable in HeLa cell extracts due to the opposing action of protein phosphatases.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279380	Ser1030	MSEGSDDsGLHGARP	Homo sapiens
pmid	sentence
25453754	Mass spectrometry revealed that PLK1 phosphorylates REST on serine-1030 ( xref and xref ).\|Notably, PLK1 depletion significantly increased REST protein half-life (XREF_FIG, XREF_SUPPLEMENTARY), indicating PLK1 antagonizes REST abundance by restraining REST protein stability.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-276220	Ser108	DKYGQNEsFARIQVR	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276216	Ser214	TVLTAQEsFSGSLGH	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276199	Ser291	CDVKTDDsVVPCFMK	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276212	Ser321	SKPSGNDsCELRNLK	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276197	Ser333	NLKSVQNsHFKEPLV	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276198	Ser345	PLVSDEKsSELIITD	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276200	Ser362	TLKNKTEsSLLAKLE	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276208	Ser363	LKNKTESsLLAKLEE	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276206	Ser37	EDLTDELsLNKISAD	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276202	Thr12	DLSGRELtIDSIMNK	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276219	Thr210	LSASTVLtAQESFSG	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276204	Thr33	KFKNEDLtDELSLNK	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276210	Thr371	LLAKLEEtKEYQEPE	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276222	Thr458	CKTPSSNtLDDYMSC	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276218	Thr46	NKISADTtDNSGTVN	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276214	Thr564	LEEADNQtLDSYRNE	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276221	Thr594	RLYDYEItDQYIYMV	in vitro
pmid	sentence
26119734	Here, we demonstrate that Plk1 promotes checkpoint signaling at kinetochores through the phosphorylation of at least two Mps1 substrates, including KNL-1 and Mps1 itself. As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the SAC components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores. Plk1 Targets Mps1 Autophosphorylation Sites In Vitro

Identifier	Residue	Organism
SIGNOR-278246		Homo sapiens
pmid	sentence
26119734	As a result, Plk1 activity enhances Mps1 catalytic activity as well as the recruitment of the spindle assembly checkpoint components Mad1:C-Mad2 and Bub3:BubR1 to kinetochores.\|When assayed in vitro, Plk1 readily phosphorylated kinase-dead Mps1, confirming earlier data (Dou et al., 2011).

Publications:

18

Organism:

In Vitro, Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-166317	Ser110	SDKKEKKsFSLEEKS	Homo sapiens
pmid	sentence
20573420	Here, we show that polo-like kinase 1 (plk1) is a novel interacting protein of pinx1. Plk1 interacts with and phosphorylates pinx1 in vivo and in vitro. Moreover, plk1-mediated phosphorylation of pinx1 at five phosphorylation sites is essential for its plk1-induced degradation.

Identifier	Residue	Sequence	Organism
SIGNOR-166321	Ser117	SFSLEEKsKISKNRV	Homo sapiens
pmid	sentence
20573420	Here, we show that polo-like kinase 1 (plk1) is a novel interacting protein of pinx1. Plk1 interacts with and phosphorylates pinx1 in vivo and in vitro. Moreover, plk1-mediated phosphorylation of pinx1 at five phosphorylation sites is essential for its plk1-induced degradation.

Identifier	Residue	Sequence	Organism
SIGNOR-166325	Ser226	ATGKDVEsYLQPKAK	Homo sapiens
pmid	sentence
20573420	Here, we show that polo-like kinase 1 (plk1) is a novel interacting protein of pinx1. Plk1 interacts with and phosphorylates pinx1 in vivo and in vitro. Moreover, plk1-mediated phosphorylation of pinx1 at five phosphorylation sites is essential for its plk1-induced degradation.

Identifier	Residue	Sequence	Organism
SIGNOR-166329	Thr141	DLSSRSKtDLDCIFG	Homo sapiens
pmid	sentence
20573420	Here, we show that polo-like kinase 1 (plk1) is a novel interacting protein of pinx1. Plk1 interacts with and phosphorylates pinx1 in vivo and in vitro. Moreover, plk1-mediated phosphorylation of pinx1 at five phosphorylation sites is essential for its plk1-induced degradation.

Identifier	Residue	Sequence	Organism
SIGNOR-166333	Thr317	EDATLEEtLVKKKKK	Homo sapiens
pmid	sentence
20573420	Here, we show that polo-like kinase 1 (plk1) is a novel interacting protein of pinx1. Plk1 interacts with and phosphorylates pinx1 in vivo and in vitro. Moreover, plk1-mediated phosphorylation of pinx1 at five phosphorylation sites is essential for its plk1-induced degradation.

Publications:

5

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-275534	Ser1137	KRLRPEDsFMSVYPM	Homo sapiens	HeLa Cell
pmid	sentence
15737063	Two phosphorylation sites in Scc1 (Thr144 and Thr312) match the consensus proposed by Nakajima et al. [24]. These two sites, in addition to one in Scc1 (Ser454) and three in SA2 (Thr1109, Ser1137, and Ser1224) conform with the consensus proposed by Barr et al. [25]. These findings are consistent with the possibility that at least some of the sites in Scc1 and SA2 are directly phosphorylated by Plk1.\|Phosphorylation of SA2 Is Essential for the Dissociation of Cohesin from Chromosomes during Prophase and Prometaphase

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-275532	Ser1224	PASIMDEsVLGVSMF	Homo sapiens	HeLa Cell
pmid	sentence
15737063	Two phosphorylation sites in Scc1 (Thr144 and Thr312) match the consensus proposed by Nakajima et al. [24]. These two sites, in addition to one in Scc1 (Ser454) and three in SA2 (Thr1109, Ser1137, and Ser1224) conform with the consensus proposed by Barr et al. [25]. These findings are consistent with the possibility that at least some of the sites in Scc1 and SA2 are directly phosphorylated by Plk1.\|Phosphorylation of SA2 Is Essential for the Dissociation of Cohesin from Chromosomes during Prophase and Prometaphase

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-275533	Thr1109	MWLSREQtLHTPVMM	Homo sapiens	HeLa Cell
pmid	sentence
15737063	Two phosphorylation sites in Scc1 (Thr144 and Thr312) match the consensus proposed by Nakajima et al. [24]. These two sites, in addition to one in Scc1 (Ser454) and three in SA2 (Thr1109, Ser1137, and Ser1224) conform with the consensus proposed by Barr et al. [25]. These findings are consistent with the possibility that at least some of the sites in Scc1 and SA2 are directly phosphorylated by Plk1.\|Phosphorylation of SA2 Is Essential for the Dissociation of Cohesin from Chromosomes during Prophase and Prometaphase

Publications:

3

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-176079	Ser118	LMEPEGEsYEDPPQE	Homo sapiens
pmid	sentence
19889641	Polo-like kinase (plk) family (plk1, plk2, and plk3) phosphorylate alpha-syn and beta-syn specifically at ser-129 and ser-118, respectively. Polo-like kinase 2 (plk2) phosphorylates alpha-synuclein at serine 129 in central nervous system. The membrane association of pd-linked mutant alpha -synuclein, but not wild-type -synuclein, was increased by serine 129 phosphorylation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-139473	Ser123	EEGFGSSsPVKSPAA	Homo sapiens
pmid	sentence
16085715	Phosphorylation of serines 53 and 123 (s53 and s123) of wee1a by polo-like kinase 1 (plk1) and cdk, respectively, are required for binding to beta-trcp.

Identifier	Residue	Sequence	Organism
SIGNOR-139477	Ser53	GHSTGEDsAFQEPDS	Homo sapiens
pmid	sentence
16085715	Phosphorylation of serines 53 and 123 (s53 and s123) of wee1a by polo-like kinase 1 (plk1) and cdk, respectively, are required for binding to beta-trcp.

Identifier	Residue	Sequence	Organism
SIGNOR-128643	Ser53	GHSTGEDsAFQEPDS	Homo sapiens
pmid	sentence
15350223	Phosphorylation of serines 53 and 123 (s53 and s123) of wee1a by polo-like kinase 1 (plk1) and cdk, respectively, are required for binding to beta-trcp.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-123832	Ser53	GHSTGEDsAFQEPDS	Homo sapiens	HeLa Cell
pmid	sentence
15070733	Phosphorylation of serines 53 and 123 (s53 and s123) of wee1a by polo-like kinase 1 (plk1) and cdk, respectively, are required for binding to beta-trcp.

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-278321	Ser1234	QGYDNSEsSVRKACV	Homo sapiens
pmid	sentence
23045552	Cdk1 and Plk1 mediate a CLASP2 phospho-switch that stabilizes kinetochore-microtubule attachments.\|Finally, we demonstrate that CLASP2 phosphorylation on S1234 and S1255 by Cdk1 and Plk1, respectively, increases with conditions that allow the establishment and stabilization of KT\u2013MT attachments ( xref ).

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-105707	Ser126	PILVDTAsPSPMETS	Homo sapiens	HeLa Cell
pmid	sentence
11242082	Phosphorylation of cyclin b1 is central to its nuclear translocationduring cell-cycle progression in hela cells, a change in the kinase activity of endogenous plk1 toward s147 and/or s133 correlates with a kinase activity in the cell extractsa mutant cyclin b1 in which s133 and s147 are replaced by alanines remains in the cytoplasm, whereas wild-type cyclin b1 accumulates in the nucleus during prophase.Together, these results suggest that phosphorylation of s133 and s147 is necessary for the nuclear translocation of cyclin b1 during prophase, and that phosphorylation of s126 and s128 may stimulate the nuclear translocation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-105711	Ser128	LVDTASPsPMETSGC	Homo sapiens	HeLa Cell
pmid	sentence
11242082	Phosphorylation of cyclin b1 is central to its nuclear translocationduring cell-cycle progression in hela cells, a change in the kinase activity of endogenous plk1 toward s147 and/or s133 correlates with a kinase activity in the cell extractsa mutant cyclin b1 in which s133 and s147 are replaced by alanines remains in the cytoplasm, whereas wild-type cyclin b1 accumulates in the nucleus during prophase.Together, these results suggest that phosphorylation of s133 and s147 is necessary for the nuclear translocation of cyclin b1 during prophase, and that phosphorylation of s126 and s128 may stimulate the nuclear translocation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-105715	Ser133	SPSPMETsGCAPAEE	Homo sapiens	HeLa Cell
pmid	sentence
11242082	Phosphorylation of cyclin b1 is central to its nuclear translocationduring cell-cycle progression in hela cells, a change in the kinase activity of endogenous plk1 toward s147 and/or s133 correlates with a kinase activity in the cell extractsa mutant cyclin b1 in which s133 and s147 are replaced by alanines remains in the cytoplasm, whereas wild-type cyclin b1 accumulates in the nucleus during prophase.Together, these results suggest that phosphorylation of s133 and s147 is necessary for the nuclear translocation of cyclin b1 during prophase, and that phosphorylation of s126 and s128 may stimulate the nuclear translocation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-105719	Ser147	EDLCQAFsDVILAVN	Homo sapiens	HeLa Cell
pmid	sentence
11242082	Phosphorylation of cyclin b1 is central to its nuclear translocationduring cell-cycle progression in hela cells, a change in the kinase activity of endogenous plk1 toward s147 and/or s133 correlates with a kinase activity in the cell extractsa mutant cyclin b1 in which s133 and s147 are replaced by alanines remains in the cytoplasm, whereas wild-type cyclin b1 accumulates in the nucleus during prophase.Together, these results suggest that phosphorylation of s133 and s147 is necessary for the nuclear translocation of cyclin b1 during prophase, and that phosphorylation of s126 and s128 may stimulate the nuclear translocation.

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-189045	Ser129	NEAYEMPsEEGYQDY	Homo sapiens
pmid	sentence
19889641	Polo-like kinase (plk) family (plk1, plk2, and plk3) phosphorylate alpha-syn and beta-syn specifically at ser-129 and ser-118, respectively. Polo-like kinase 2 (plk2) phosphorylates alpha-synuclein at serine 129 in central nervous system. The membrane association of pd-linked mutant alpha -synuclein, but not wild-type -synuclein, was increased by serine 129 phosphorylation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-160233	Ser1337	LDSDEDFsDFDEKTD	Homo sapiens
pmid	sentence
18171681	Plk1 phosphorylates ser(1337) and ser(1524) of topoiialpha plk1-associated phosphorylation is essential for the functions of topoiialpha in mitosis

Identifier	Residue	Sequence	Organism
SIGNOR-182844	Ser1525	PIKYLEEsDEDDLF	Homo sapiens
pmid	sentence
19098900	Here we report that when phosphorylated, ser 1524 of topo iialpha acts as a binding site for the brct domain of mdc1 (mediator of dna damage checkpoint protein-1), thereby recruiting mdc1 to chromatin

Identifier	Residue	Sequence	Organism
SIGNOR-160237	Ser1525	PIKYLEEsDEDDLF	Homo sapiens
pmid	sentence
18171681	Plk1 phosphorylates ser(1337) and ser(1524) of topoiialpha plk1-associated phosphorylation is essential for the functions of topoiialpha in mitosis

Publications:

3

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-149073	Ser135	DRKVKAKsIVFHRKK	Homo sapiens
pmid	sentence
16930555	Plk1 is capable of phosphorylating co-immunoprecipitated ran in vitro on serine-135 and ran is phosphorylated in vivo at the same site during mitosis when plk1 is normally activated. Deregulation of ran phosphorylation disrupts normal spindle structure and segregation of chromosomes.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-273590	Ser1359	ENVGKVGsPLDYSLV	Homo sapiens	HeLa Cell
pmid	sentence
26259146	Moreover, CDK1 phosphorylates RSF1 at Ser1375, and this phosphorylation is necessary for PLK1 recruitment. Subsequently, PLK1 phosphorylates RSF1 at Ser1359, stabilizing PLK1 deposition.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-277076	Ser137	LELCRRRsLLELHKR	Homo sapiens
pmid	sentence
35546066	PPP4C dephosphorylated PLK1 at the S137 site, negatively regulating its activity in the DSB response in early embryonic cells.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279502	Ser137	LELCRRRsLLELHKR	Homo sapiens
pmid	sentence
34197606	These results suggest that both PLK1 S137 and T210 sites can be phosphorylated in vitro by CHK1, but that S137 is the major site.\|We reason that PARG and CHK1 inhibitors should also cause synthetic lethality : PARG inhibition sustains PLK1 inhibition at the PAR forest , while CHK1 inhibition blocks PLK1 reactivation and RAD51 phosphorylation at S14 and T309 .

Identifier	Residue	Sequence	Organism
SIGNOR-279501	Thr210	YDGERKKtLCGTPNY	Homo sapiens
pmid	sentence
34197606	These results suggest that both PLK1 S137 and T210 sites can be phosphorylated in vitro by CHK1, but that S137 is the major site.\|We reason that PARG and CHK1 inhibitors should also cause synthetic lethality : PARG inhibition sustains PLK1 inhibition at the PAR forest , while CHK1 inhibition blocks PLK1 reactivation and RAD51 phosphorylation at S14 and T309 .

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-263098	Ser138	RPPVLDEsWIREQTT	Homo sapiens
pmid	sentence
25482198	Here, we show that SUN1, located in the INM, undergoes mitosis-specific phosphorylation on at least 3 sites within its nucleoplasmic N-terminus. We further identify Cdk1 as the kinase responsible for serine 48 and 333 phosphorylation, while serine 138 is phosphorylated by Plk1. Together, these data support a model whereby mitotic phosphorylation of SUN1 disrupts interactions with nucleoplasmic binding partners, promoting disassembly of the nuclear lamina and, potentially, its chromatin interactions.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-265228	Ser138	MEDLTNVsSLLNMER	Homo sapiens
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism
SIGNOR-265233	Ser139	EDLTNVSsLLNMERA	Homo sapiens
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265227	Ser248	DLDILHNsSQMKSMS	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265230	Ser249	LDILHNSsQMKSMST	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265232	Ser253	HNSSQMKsMSTFIEE	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265226	Ser255	SSQMKSMsTFIEEAY	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265231	Thr123	RLLQQCEtLKVPPKK	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265234	Thr135	PKKMEDLtNVSSLLN	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265229	Thr256	SQMKSMStFIEEAYK	Homo sapiens	HeLa Cell
pmid	sentence
25670858	Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. From these analyses, we identified nine CENP-Q residues (Thr-123, Thr-135, Ser-138, Ser-139, Ser-248, Ser-249, Ser-253, Ser-255, and Thr-256) that were phosphorylated in both in vitro and in vivo samples (Fig. 4B), suggesting that Plk1 phosphorylates these sites.

Publications:

9

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276082	Ser1399	KVNFSDDsDLEDPVS	Homo sapiens	HEK-293T Cell
pmid	sentence
17974570	Although mutation of serine 1126 and threonine 1346 to alanine had no effect (lanes 2 and 5), additional mutation of threonine 1363 and serine 1399 rendered separase almost completely resistant to phosphorylation (lane 3). Serine 1399 seems to be the one residue within this large separase fragment that is most efficiently phosphorylated by polo-like kinase, because a corresponding point mutation was sufficient to reduce the labeling by 80% compared with wild type (lane 6).

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276083	Thr1363	AGPHVPFtVFEEVCP	Homo sapiens	HEK-293T Cell
pmid	sentence
17974570	Although mutation of serine 1126 and threonine 1346 to alanine had no effect (lanes 2 and 5), additional mutation of threonine 1363 and serine 1399 rendered separase almost completely resistant to phosphorylation (lane 3). Serine 1399 seems to be the one residue within this large separase fragment that is most efficiently phosphorylated by polo-like kinase, because a corresponding point mutation was sufficient to reduce the labeling by 80% compared with wild type (lane 6).

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-278187	Ser14	LEANADTsVEEESFG	Homo sapiens
pmid	sentence
26811421	Mechanistically, TOPBP1 physically binds PLK1 and promotes PLK1 kinase-mediated phosphorylation of RAD51 at serine 14, a modification required for RAD51 recruitment to chromatin.\|Mechanistically, TOPBP1 physically binds PLK1 and promotes PLK1 kinase\u2013mediated phosphorylation of RAD51 at serine 14, a modification required for RAD51 recruitment to chromatin.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence
SIGNOR-274054	Ser146	LLTFPNSsPGLRRQK
pmid	sentence
23972993	Priming phosphorylation of Cdh1 by the Cdk2/cyclin A kinase complex allows Plk1 to bind to Cdh1 and phosphorylate Cdh1 at Ser138 and Ser146. Phosphorylation of Cdh1 at Ser138 and Ser146 then triggers its interaction with, and subsequent ubiquitination by, SCFbeta-TRCP

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-274053
pmid	sentence
23972993	Priming phosphorylation of Cdh1 by the Cdk2/cyclin A kinase complex allows Plk1 to bind to Cdh1 and phosphorylate Cdh1 at Ser138 and Ser146. Phosphorylation of Cdh1 at Ser138 and Ser146 then triggers its interaction with, and subsequent ubiquitination by, SCFbeta-TRCP

Publications:

2

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277904	Ser15	KSKLKKLsEDSLTKQ	Homo sapiens	HEK-293T Cell
pmid	sentence
37739411	We conclude that TRIM69A promotes multi-site phosphorylation of MST2.We demonstrate that TRIM69 stimulates formation of an MST2-PLK1 complex and promotes phosphorylation of MST2 at S15, a known PLK1 site. PLK1-mediated MST2 phosphorylation at S15 is necessary for subsequent phosphorylation of NEK2A to dissociate c-NAP1 from daughter centrioles (7). Thus, we provide a new molecular mechanism by which TRIM69 promotes MST2- and PLK1-mediated centrosome disjunction.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-185746	Ser157	GSILSDIsFDKTDES	Homo sapiens
pmid	sentence
19468302	Tandem mass spectrometry analysis of a purified hscyk-4 fragment (hscyk-4n) phosphorylated by plk1 in vitro identified four major sites (s157, s170, s214, and s260 plk1 phosphorylation of hscyk-4 localizes ect2 at the midzone and stimulates rhoa-dependent contractile ring assembly at the equatorial cortex.

Identifier	Residue	Sequence	Organism
SIGNOR-185750	Ser170	ESLDWDSsLVKTFKL	Homo sapiens
pmid	sentence
19468302	Tandem mass spectrometry analysis of a purified hscyk-4 fragment (hscyk-4n) phosphorylated by plk1 in vitro identified four major sites (s157, s170, s214, and s260 plk1 phosphorylation of hscyk-4 localizes ect2 at the midzone and stimulates rhoa-dependent contractile ring assembly at the equatorial cortex.

Identifier	Residue	Sequence	Organism
SIGNOR-185754	Ser214	AVDQGNEsIVAKTTV	Homo sapiens
pmid	sentence
19468302	Tandem mass spectrometry analysis of a purified hscyk-4 fragment (hscyk-4n) phosphorylated by plk1 in vitro identified four major sites (s157, s170, s214, and s260 plk1 phosphorylation of hscyk-4 localizes ect2 at the midzone and stimulates rhoa-dependent contractile ring assembly at the equatorial cortex.

Identifier	Residue	Sequence	Organism
SIGNOR-185758	Thr260	QPWNSDStLNSRQLE	Homo sapiens
pmid	sentence
19468302	Tandem mass spectrometry analysis of a purified hscyk-4 fragment (hscyk-4n) phosphorylated by plk1 in vitro identified four major sites (s157, s170, s214, and s260 plk1 phosphorylation of hscyk-4 localizes ect2 at the midzone and stimulates rhoa-dependent contractile ring assembly at the equatorial cortex.

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-264413	Ser1618	LTKAADIsLDNLVEG	in vitro
pmid	sentence
24703952	Here we show that 53BP1 is phosphorylated during mitosis on two residues, T1609 and S1618, located in its well-conserved ubiquitination-dependent recruitment (UDR) motif.\|Dephosphorylation enables the recruitment of 53BP1 to double-strand DNA breaks \|Addition of the inhibitors for PLK1 and the p38 MAPK leads to a complete loss of pT1609/pS1618 signal within 3 hr in mitotic cells

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-276493	Ser170	KTCRYIPsLPDRILD	in vitro
pmid	sentence
23643811	Plk1 directly bound to Cdc20 and phosphorylates it on serine-170 located in CRY-box. Whereas wild-type Cdc20 was degraded according to progress cell cycle beyond mitosis, the phosphorylation-defective mutant, which serine-170 was changed into alanine, was not destroyed in early G1 phase.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-279254	Ser174	SGEKNEGsESAPEGQ	Homo sapiens
pmid	sentence
36805592	Here we identify that PLK1 inhibition can induce apoptosis and DNA damage of GSCs, we have also delineat the possible underlying molecular mechanisms: PLK1 interacts with YBX1 and directly phosphorylates serine 174 and serine 176 of YBX1.\|Inhibition of PLK1 reduces the phosphorylation level of YBX1, and decreased phosphorylation of YBX1 prevents its nuclear translocation, thereby inducing apoptosis and DNA damage of GSCs.

Identifier	Residue	Sequence	Organism
SIGNOR-279255	Ser176	EKNEGSEsAPEGQAQ	Homo sapiens
pmid	sentence
36805592	Here we identify that PLK1 inhibition can induce apoptosis and DNA damage of GSCs, we have also delineat the possible underlying molecular mechanisms: PLK1 interacts with YBX1 and directly phosphorylates serine 174 and serine 176 of YBX1.\|Inhibition of PLK1 reduces the phosphorylation level of YBX1, and decreased phosphorylation of YBX1 prevents its nuclear translocation, thereby inducing apoptosis and DNA damage of GSCs.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-275535	Ser175	REIMREGsAFEDDDM	Homo sapiens	HeLa Cell
pmid	sentence
15737063	We suspected that the observed enhancement of Scc1's cleavability in the presence of Plk1 might be due to phosphorylation at two sites that are directly adjacent to the cleavage sites, Ser175 and Ser454, which we had found to be phosphorylated in mitosis in vivo (Table 1). We therefore mutated these two residues to alanine, thereby creating mutant Scc1-S175A/S454A (see Figure 1C), and tested the cleavability of this mutant in the absence or presence of Plk1 in vitro. \|Scc1 phosphorylation is dispensable for cohesin dissociation from chromosomes in early mitosis but enhances the cleavability of Scc1 by separase.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-275536	Ser454	EPSRLQEsVMEASRT	Homo sapiens	HeLa Cell
pmid	sentence
15737063	We suspected that the observed enhancement of Scc1's cleavability in the presence of Plk1 might be due to phosphorylation at two sites that are directly adjacent to the cleavage sites, Ser175 and Ser454, which we had found to be phosphorylated in mitosis in vivo (Table 1). We therefore mutated these two residues to alanine, thereby creating mutant Scc1-S175A/S454A (see Figure 1C), and tested the cleavability of this mutant in the absence or presence of Plk1 in vitro. \|Scc1 phosphorylation is dispensable for cohesin dissociation from chromosomes in early mitosis but enhances the cleavability of Scc1 by separase.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-196367	Ser177	SSGSSEDsFVEIRMA	Homo sapiens
pmid	sentence
22365832	Here we show that at mitotic entry, plk1 phosphorylates optineurin (optn) at serine 177 and that this dissociates optn from the golgi-localized gtpase rab8, inducing its translocation into the nucleus.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-167281	Ser179	SASAGELsSSEPSTP	Homo sapiens
pmid	sentence
20679239	Plk1-mediated phosphorylation of p150(glued) at ser-179 positively regulates its accumulation at the nuclear envelope during prophase.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277491	Ser1791	REPLGEDsVGLKPLK	Homo sapiens	HaCaT Cell
pmid	sentence
31597699	As shown in Fig. S4D, the C-terminal NOTCH1 fragment was readily phosphorylated by PLK1. Additionally, when the two putative phosphorylation sites, Ser-1791 and Ser-2349, were replaced by Ala, WT NOTCH1-IC but not the mutant was efficiently phosphorylated (Fig. S4E). We found that mutation of Ser-1791/2349 promotes NOTCH1-IC stabilization (Fig. S4F).

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277490	Ser2439	SFLSGEPsQADVQPL	Homo sapiens	HaCaT Cell
pmid	sentence
31597699	As shown in Fig. S4D, the C-terminal NOTCH1 fragment was readily phosphorylated by PLK1. Additionally, when the two putative phosphorylation sites, Ser-1791 and Ser-2349, were replaced by Ala, WT NOTCH1-IC but not the mutant was efficiently phosphorylated (Fig. S4E). We found that mutation of Ser-1791/2349 promotes NOTCH1-IC stabilization (Fig. S4F).

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-275467	Ser1817	GDSIADVsIMYSEEL	Homo sapiens	HeLa Cell
pmid	sentence
26192437	Here we show that LRRK1 is a PLK1 substrate that is phosphorylated on Ser 1790. PLK1 phosphorylation is required for CDK1-mediated activation of LRRK1 at the centrosomes

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-102486	Ser193	AEVDPDMsWSSSLAT	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	M phase-specific phosphorylation of brca2 by polo-like kinase 1 correlates with the dissociation of the brca2-p/caf complex.Plk1 interacts with brca2 in vivo, and mutation of ser193, ser205/206, and thr203/207 to ala in br-n1 abolished plk1 phosphorylation, suggesting that brca2 is the substrate of plk1

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-102490	Ser205	LATPPTLsSTVLIVR	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	M phase-specific phosphorylation of brca2 by polo-like kinase 1 correlates with the dissociation of the brca2-p/caf complex.Plk1 interacts with brca2 in vivo, and mutation of ser193, ser205/206, and thr203/207 to ala in br-n1 abolished plk1 phosphorylation, suggesting that brca2 is the substrate of plk1

Identifier	Residue	Sequence	Organism
SIGNOR-102494	Ser206	ATPPTLSsTVLIVRN	Homo sapiens
pmid	sentence
12815053	M phase-specific phosphorylation of brca2 by polo-like kinase 1 correlates with the dissociation of the brca2-p/caf complex.Plk1 interacts with brca2 in vivo, and mutation of ser193, ser205/206, and thr203/207 to ala in br-n1 abolished plk1 phosphorylation, suggesting that brca2 is the substrate of plk1

Identifier	Residue	Sequence	Organism
SIGNOR-102498	Thr203	SSLATPPtLSSTVLI	Homo sapiens
pmid	sentence
12815053	M phase-specific phosphorylation of brca2 by polo-like kinase 1 correlates with the dissociation of the brca2-p/caf complex.Plk1 interacts with brca2 in vivo, and mutation of ser193, ser205/206, and thr203/207 to ala in br-n1 abolished plk1 phosphorylation, suggesting that brca2 is the substrate of plk1

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-102502	Thr207	TPPTLSStVLIVRNE	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	M phase-specific phosphorylation of brca2 by polo-like kinase 1 correlates with the dissociation of the brca2-p/caf complex.Plk1 interacts with brca2 in vivo, and mutation of ser193, ser205/206, and thr203/207 to ala in br-n1 abolished plk1 phosphorylation, suggesting that brca2 is the substrate of plk1

Publications:

5

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-249217	Ser193	AEVDPDMsWSSSLAT	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	Plk1 interacts with BRCA2 in vivo, and mutation of Ser193, Ser205/206, and Thr203/207 to Ala in BR-N1 abolished Plk1 phosphorylation, suggesting that BRCA2 is the substrate of Plk1. Furthermore, both the hyperphosphorylated and hypophosphorylated forms of BRCA2 bind to RAD51, whereas the M phase hyperphosphorylated form of BRCA2 no longer associates with the P/CAF, suggesting that the dissociation of P/CAF-BRCA2 complex is regulated by phosphorylation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-249218	Ser205	LATPPTLsSTVLIVR	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	Plk1 interacts with BRCA2 in vivo, and mutation of Ser193, Ser205/206, and Thr203/207 to Ala in BR-N1 abolished Plk1 phosphorylation, suggesting that BRCA2 is the substrate of Plk1. Furthermore, both the hyperphosphorylated and hypophosphorylated forms of BRCA2 bind to RAD51, whereas the M phase hyperphosphorylated form of BRCA2 no longer associates with the P/CAF, suggesting that the dissociation of P/CAF-BRCA2 complex is regulated by phosphorylation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-249219	Ser206	ATPPTLSsTVLIVRN	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	Plk1 interacts with BRCA2 in vivo, and mutation of Ser193, Ser205/206, and Thr203/207 to Ala in BR-N1 abolished Plk1 phosphorylation, suggesting that BRCA2 is the substrate of Plk1. Furthermore, both the hyperphosphorylated and hypophosphorylated forms of BRCA2 bind to RAD51, whereas the M phase hyperphosphorylated form of BRCA2 no longer associates with the P/CAF, suggesting that the dissociation of P/CAF-BRCA2 complex is regulated by phosphorylation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-249220	Thr203	SSLATPPtLSSTVLI	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	Plk1 interacts with BRCA2 in vivo, and mutation of Ser193, Ser205/206, and Thr203/207 to Ala in BR-N1 abolished Plk1 phosphorylation, suggesting that BRCA2 is the substrate of Plk1. Furthermore, both the hyperphosphorylated and hypophosphorylated forms of BRCA2 bind to RAD51, whereas the M phase hyperphosphorylated form of BRCA2 no longer associates with the P/CAF, suggesting that the dissociation of P/CAF-BRCA2 complex is regulated by phosphorylation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-249221	Thr207	TPPTLSStVLIVRNE	Homo sapiens	U2-OS Cell
pmid	sentence
12815053	Plk1 interacts with BRCA2 in vivo, and mutation of Ser193, Ser205/206, and Thr203/207 to Ala in BR-N1 abolished Plk1 phosphorylation, suggesting that BRCA2 is the substrate of Plk1. Furthermore, both the hyperphosphorylated and hypophosphorylated forms of BRCA2 bind to RAD51, whereas the M phase hyperphosphorylated form of BRCA2 no longer associates with the P/CAF, suggesting that the dissociation of P/CAF-BRCA2 complex is regulated by phosphorylation.

Publications:

5

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-168204	Ser194	QNRSGAMsPMSWNSD	Homo sapiens
pmid	sentence
20890306	Fas-associated death domain-containing protein (FADD) was first identified as an adapter molecule involved in formation of a death-inducing signaling complex upon Fas stimulation\| Plk1 phosphorylates fadd at ser-194 in response to treatment with taxol Phosphorylation by polo-like kinase 1 induces the tumor-suppressing activity of FADD

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-167172	Ser195	LTKTASEsISNLSEA	Homo sapiens
pmid	sentence
20664522	Furthermore, we provide evidence that plk1 phosphorylation of clip-170 at s195 enhances its association with ck2

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-115993	Ser198	SDELMEFsLKDQEAK	Homo sapiens
pmid	sentence
11897663	The nuclear accumulation of active m-phase promoting factor (mpf) during prophase is thought to be essential for coordinating m-phase events in vertebrate cells. The protein phosphatase cdc25c, an activator of mpf, enters the nucleus to keep mpf active in the nucleus during prophase. these results suggest that plk1 phosphorylates cdc25c on ser198 and regulates nuclear translocation of cdc25c during prophase.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-170460	Ser20	FLKDHRIsTFKNWPF	Homo sapiens
pmid	sentence
21148584	Thus, we conclude that plk1-mediated phosphorylation of sur at ser20 is critical for accurate chromosome segregation\|SUR (survivin)

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-252050	Ser204	HLDSSKIsVLEPPQE	Homo sapiens
pmid	sentence
22535524	We show that Plk1 directly phosphorylates Kif2b at threonine 125 (T125) and serine 204 (S204), and that these two sites differentially regulate Kif2b function. Phosphorylation of S204 is required for the kinetochore localization and activity of Kif2b in prometaphase, and phosphorylation of T125 is required for Kif2b activity in the correction of k-MT attachment errors.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-252049	Thr125	MIPQKNQtASGDSLD	Homo sapiens	U2-OS Cell
pmid	sentence
22535524	We show that Plk1 directly phosphorylates Kif2b at threonine 125 (T125) and serine 204 (S204), and that these two sites differentially regulate Kif2b function. Phosphorylation of S204 is required for the kinetochore localization and activity of Kif2b in prometaphase, and phosphorylation of T125 is required for Kif2b activity in the correction of k-MT attachment errors.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-180915	Ser216	IPLMLNDsGSAHSMP	Homo sapiens
pmid	sentence
18794143	Hsf1 was phosphorylated by plk1 at ser(216) of the dsgxxs motif during the timing of mitosis and a phospho-defective mutant form of hsf1 inhibited mitotic progression. Phosphorylated hsf1 during spindle pole localization underwent ubiquitin degradation through the scf(beta-trcp) pathway.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277463	Ser234	GKFVLKAsLSAPGSE	Homo sapiens	HEK-293T Cell
pmid	sentence
31281496	We further found that inhibition of polo-like kinase 1 could downregulate the expression of KLF4 and that PLK1 directly phosphorylated KLF4 at Ser234. Notably, phosphorylation of KLF4 by PLK1 caused the recruitment and binding of the E3 ligase TRAF6, which resulted in KLF4 K32 K63-linked ubiquitination and stabilization.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-273729	Ser238	SFSGRDSsFTEVPRS	Homo sapiens	HEK-293 Cell
pmid	sentence
23750008	PLK1 phosphorylates Ser238 of SVIL, which can promote the localization of SVIL to the central spindle and association with PRC1. Expression of a PLK1 phosphorylation site mutant, S238A-SVIL, inhibited myosin II activation at the equatorial cortex and induced aberrant furrowing.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-135688	Ser24	GYLRKPKsMHKRFFV	Homo sapiens
pmid	sentence
15849359	Phosphorylation of ser24 in the pleckstrin homology domain of insulin receptor substrate-1 by mouse pelle-like kinase/interleukin-1 receptor-associated kinase\| irs-1 mutants s24d or s24e (mimicking phosphorylation at ser(24)) had impaired ability to associate with insulin receptors resulting in diminished tyrosine phosphorylation of irs-1 and impaired ability of irs-1 to bind and activate pi-3 kinase in response to insulin.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-188471	Ser260	SLDSEDYsLSEEGQE	Homo sapiens
pmid	sentence
19833129	Polo-like kinase-1 phosphorylates mdm2 at ser260 and stimulates mdm2-mediated p53 turnover.

Identifier	Residue	Sequence	Organism
SIGNOR-94272	Ser260	SLDSEDYsLSEEGQE	Homo sapiens
pmid	sentence
12383858	Here we show that the oncogenic and cell cycle-regulatory protein kinase, polo-like kinase-1 (plk1), phosphorylates mdm2 at one of these residues, ser260, and stimulates mdm2-mediated turnover of p53. These data are consistent with the idea that deregulation of plk1 during tumourigenesis may help suppress p53 function.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-103403	Ser274	KKINPENsKLSDLDS	Homo sapiens	HeLa Cell
pmid	sentence
12852857	Here, we characterize the interaction between plk1 and nudc, show that plk1 phosphorylates nudc at conserved s274 and s326 residues in vitro, and present evidence that nudc is also a substrate for plk1 in vivo. Downregulation of nudc by rna interference results in multiple mitotic defects, including multinucleation and cells arrested at the midbody stage, which are rescued by ectopic expression of wild-type nudc, but not by nudc with mutations in the plk1 phosphorylation sites.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-103407	Ser326	QHPEMDFsKAKFN	Homo sapiens	HeLa Cell
pmid	sentence
12852857	Here, we characterize the interaction between plk1 and nudc, show that plk1 phosphorylates nudc at conserved s274 and s326 residues in vitro, and present evidence that nudc is also a substrate for plk1 in vivo. Downregulation of nudc by rna interference results in multiple mitotic defects, including multinucleation and cells arrested at the midbody stage, which are rescued by ectopic expression of wild-type nudc, but not by nudc with mutations in the plk1 phosphorylation sites.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-272990	Ser286	KFIMGDSsVQDQWKE	Homo sapiens	HeLa Cell
pmid	sentence
23348582	Cdk1-cyclin B1 directly phosphorylates PTP1B at serine 386 in a kinase assay. Recombinant Plk1 phosphorylates PTP1B on serine 286 and 393 in vitro, however, it requires a priming phosphorylation by Cdk1 at serine 386 highlighting a novel co-operation between Cdk1 and Plk1 in the regulation of PTP1B.\|Finally, phosphorylation on serine 286 enhanced PTP1B phosphatase activity.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-278419	Ser288	ESRSPQQsAALPRRY	Homo sapiens
pmid	sentence
28717250	Plk1 phosphorylation of CAP-H2 at Ser288 is required for the accumulation of CAP-H2 and accurate chromosomal condensation during prophase.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-166564	Ser289	SDENKENsFSADHVT	Homo sapiens
pmid	sentence
20615875	We also demonstrate that asap is a novel substrate of plk1 phosphorylation and have identified serine 289 as the major phosphorylation site by plk1 in vivo. Asap phosphorylated on serine 289 is localized to centrosomes during mitosis, but this phosphorylation is not required for its plk1-dependent localization at the spindle poles. We show that phosphorylated asap on serine 289 contributes to spindle pole stability in a microtubule-dependent manner

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-148447	Ser30	EADSPSDsGQGSYET	Homo sapiens
pmid	sentence
16885022	We show that claspin, an adaptor protein required for chk1 activation, becomes degraded at the onset of mitosis. Claspin degradation was triggered by its interaction with, and ubiquitylation by, the scfbtrcp ubiquitin ligase. This interaction was phosphorylation dependent and required the activity of the plk1 kinase

Identifier	Residue	Sequence	Organism
SIGNOR-148442	Ser30	EADSPSDsGQGSYET	Homo sapiens
pmid	sentence
16885021	We show that claspin, an adaptor protein required for chk1 activation, becomes degraded at the onset of mitosis. Claspin degradation was triggered by its interaction with, and ubiquitylation by, the scfbtrcp ubiquitin ligase. This interaction was phosphorylation dependent and required the activity of the plk1 kinase

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence
SIGNOR-275559	Ser303	QKQPGVDsLSPVASL
pmid	sentence
25855382	PLK1 and HOTAIR Accelerate Proteasomal Degradation of SUZ12 and ZNF198 during Hepatitis B Virus-Induced Liver Carcinogenesis\|Similar analyses with ZNF198 identified two clusters of putative Plk1 phosphorylation sites in vitro. A cluster of serine residues at the N-terminus of ZNF198, S303, S305, and S309, and a cluster at the C-terminus, S1056 and S1064. The triple Ser to Ala mutant, S303A/S305A/S309A, consistently exhibited the lowest level of phosphorylation in vitro, in comparison to the double S1056A/S1064A mutant

Identifier	Residue	Sequence
SIGNOR-275558	Ser305	QPGVDSLsPVASLPK
pmid	sentence
25855382	PLK1 and HOTAIR Accelerate Proteasomal Degradation of SUZ12 and ZNF198 during Hepatitis B Virus-Induced Liver Carcinogenesis\|Similar analyses with ZNF198 identified two clusters of putative Plk1 phosphorylation sites in vitro. A cluster of serine residues at the N-terminus of ZNF198, S303, S305, and S309, and a cluster at the C-terminus, S1056 and S1064. The triple Ser to Ala mutant, S303A/S305A/S309A, consistently exhibited the lowest level of phosphorylation in vitro, in comparison to the double S1056A/S1064A mutant

Identifier	Residue	Sequence
SIGNOR-275560	Ser309	DSLSPVAsLPKQIFQ
pmid	sentence
25855382	PLK1 and HOTAIR Accelerate Proteasomal Degradation of SUZ12 and ZNF198 during Hepatitis B Virus-Induced Liver Carcinogenesis\|Similar analyses with ZNF198 identified two clusters of putative Plk1 phosphorylation sites in vitro. A cluster of serine residues at the N-terminus of ZNF198, S303, S305, and S309, and a cluster at the C-terminus, S1056 and S1064. The triple Ser to Ala mutant, S303A/S305A/S309A, consistently exhibited the lowest level of phosphorylation in vitro, in comparison to the double S1056A/S1064A mutant

Publications:

3

Identifier	Residue	Sequence
SIGNOR-272989	Ser305	IYQLMDHsNMDCFIC
pmid	sentence
24484936	By phosphorylating S387 in procaspase-8 Cdk1/cyclin B1 generates a phospho-epitope for the binding of the PBD of Plk1. Subsequently, S305 in procaspase-8 is phosphorylated by Plk1 during mitosis. Using an RNAi-based strategy we could demonstrate that the extrinsic cell death is increased upon Fas-stimulation when endogenous caspase-8 is replaced by a mutant (S305A) mimicking the non-phosphorylated form. Together, our data show that sequential phosphorylation by Cdk1/cyclin B1 and Plk1 decreases the sensitivity of cells toward stimuli of the extrinsic pathway during mitosis.

Publications:

1

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277180	Ser311	SDALTDDsMSMTDSS	Homo sapiens	PC-3 Cell
pmid	sentence
26438599	Plk1 phosphorylates axin2 at Ser311.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-264575	Ser312	ASLKRSPsASSLSSM	in vitro
pmid	sentence
24451569	Plk1 phosphorylates CLIP-170 and regulates its binding to microtubules for chromosome alignment\|Here, we show that phosphorylation at Ser312 in the third serine-rich region of CLIP-170 is increased during mitosis. Polo-like kinase 1 (Plk1) is responsible for this phosphorylation during the mitotic phase of dividing cells. In vitro analysis using a purified CLIP-170 N-terminal fragment showed that phosphorylation by Plk1 diminishes CLIP-170 binding to the MT ends

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-279804	Ser312	SVSNGGDsGILSSPS	Homo sapiens
pmid	sentence
25501367	NI indicates the noninduced control. (B) Plk1 phosphorylates STARD9-motor domain at serine 312.

Identifier	Residue	Sequence	Organism
SIGNOR-279806	Ser312	SVSNGGDsGILSSPS	Homo sapiens
pmid	sentence
25501367	NI indicates the noninduced control. (B) Plk1 phosphorylates STARD9-motor domain at serine 312.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-278188	Ser3205	TPLPEDNsMNVDQDG	Homo sapiens
pmid	sentence
24844881	Moreover, PLK1 phosphorylates DNA-PKcs directly on Ser 3205 invitro, suggesting that DNA-PKcs Ser 3205 is a direct target of PLK1 in mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-179968	Ser326	LTIPPRFsIAPSSLD	Homo sapiens
pmid	sentence
18695677	Here, we have identified mk2 as a major plk1 kinase toward ser326, whose phosphorylation is critical to recruit ?-Tubulin to centrosomes and subsequent establishment of functional bipolar spindles. To our knowledge, this is the first direct evidence to demonstrate that the essential function of plk1 in centrosome maturation and bipolar spindle formation is controlled by its upstream kinase.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-274016	Ser330	ILKAFGNsTEKLDEE	in vitro
pmid	sentence
26323689	Plk1 phosphorylates and activates Usp16. In vitro phosphorylation of Usp16 with single (S330A, S386A, or S486A) or collective 3A (S330A/S386A/S486A) mutation showed that Plk1 phosphorylated Usp16 at all three sites (Fig. S2 D).

Identifier	Residue	Sequence	Organism
SIGNOR-274015	Ser386	HESFLDLsLPVLDDQ	in vitro
pmid	sentence
26323689	Plk1 phosphorylates and activates Usp16. In vitro phosphorylation of Usp16 with single (S330A, S386A, or S486A) or collective 3A (S330A/S386A/S486A) mutation showed that Plk1 phosphorylated Usp16 at all three sites (Fig. S2 D).

Identifier	Residue	Sequence	Organism
SIGNOR-274017	Ser486	SEYEAEMsLQGEVNI	in vitro
pmid	sentence
26323689	Plk1 phosphorylates and activates Usp16. In vitro phosphorylation of Usp16 with single (S330A, S386A, or S486A) or collective 3A (S330A/S386A/S486A) mutation showed that Plk1 phosphorylated Usp16 at all three sites (Fig. S2 D).

Identifier	Residue	Sequence	Organism
SIGNOR-278270	Ser486	SEYEAEMsLQGEVNI	Homo sapiens
pmid	sentence
26323689	In this study, we show that ubiquitin-specific peptidase 16 (Usp16) is a novel substrate for Plk1, and sequential phosphorylation by CDK1 and Plk1 activates Usp16, which, in turn, deubiquitinates Plk1 and promotes the recruitment of Plk1 to, and its retention on, the kinetochores for proper chromosome alignment.\|In vitro phosphorylation of Usp16 with single (S330A, S386A, or S486A) or collective 3A (S330A/S386A/S486A) mutation showed that Plk1 phosphorylated Usp16 at all three sites (Fig.

Publications:

4

Organism:

In Vitro, Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-265222	Ser331	VKRAMNKsFMESGGT	Homo sapiens
pmid	sentence
22869522	Plk1 phosphorylates Sgt1 at the kinetochores to promote timely kinetochore-microtubule attachment\|Plk1 is required for the kinetochore localization of Sgt1 and phosphorylates serine 331 of Sgt1 at the kinetochores. This phosphorylation event enhances the association of the Hsp90-Sgt1 chaperone

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence
SIGNOR-275621	Ser332	ADPVLQDsGVDLDSF
pmid	sentence
25503564	We show that the intercentrosomal linker protein Cep68 is degraded in prometaphase through the SCF(βTrCP) (Skp1-Cul1-F-box protein) ubiquitin ligase complex. Cep68 degradation is initiated by PLK1 phosphorylation of Cep68 on Ser 332, allowing recognition by βTrCP.

Publications:

1

Identifier	Residue	Sequence	Organism
SIGNOR-262937	Ser335	TKEGSEFsFSDGEVA	in vitro
pmid	sentence
21880710	Here, we report that the atypical protein kinase Rio2 is a novel substrate of Plk1 and can be phosphorylated by Plk1 at Ser-335, Ser-380, and Ser-548. Overexpression of Rio2 causes a prolonged mitotic exit whereas knockdown of Rio2 accelerates mitotic progression, suggesting that Rio2 is required for the proper mitotic progression. F urthermore, time-lapse imaging data show that overexpression of Rio2 but not Rio2 S3A results in a slowed metaphase-anaphase transition. Collectively, these findings strongly indicate that the Plk1-mediated phosphorylation of Rio2 regulates metaphase-anaphase transition during mitotic progression.

Identifier	Residue	Sequence	Organism
SIGNOR-262938	Ser380	PEQIKEDsLSEESAD	in vitro
pmid	sentence
21880710	Here, we report that the atypical protein kinase Rio2 is a novel substrate of Plk1 and can be phosphorylated by Plk1 at Ser-335, Ser-380, and Ser-548. Overexpression of Rio2 causes a prolonged mitotic exit whereas knockdown of Rio2 accelerates mitotic progression, suggesting that Rio2 is required for the proper mitotic progression.

Identifier	Residue	Sequence	Organism
SIGNOR-262939	Ser548	KSSLEAAsFWGE	in vitro
pmid	sentence
21880710	Here, we report that the atypical protein kinase Rio2 is a novel substrate of Plk1 and can be phosphorylated by Plk1 at Ser-335, Ser-380, and Ser-548. Overexpression of Rio2 causes a prolonged mitotic exit whereas knockdown of Rio2 accelerates mitotic progression, suggesting that Rio2 is required for the proper mitotic progression.

Publications:

3

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-278190	Ser338	RPRGQRDsSYYWEIE	Homo sapiens
pmid	sentence
27003818	An in vitro kinase assay demonstrated that PLK1 directly phosphorylated CRAF at S338 and S339, but not at S621 (XREF_FIG).\|These results demonstrate that PLK1 increases the stability of CRAF protein by preventing proteasome degradation.

Identifier	Residue	Sequence	Organism
SIGNOR-278191	Ser339	PRGQRDSsYYWEIEA	Homo sapiens
pmid	sentence
27003818	An in vitro kinase assay demonstrated that PLK1 directly phosphorylated CRAF at S338 and S339, but not at S621 (Figure 8C).\|These results demonstrate that PLK1 increases the stability of CRAF protein by preventing proteasome degradation.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-119881	Ser355	AALSRAHsPALGVHS	Homo sapiens
pmid	sentence
14657031	Our analysis revealed an unexpected and unprecedented complexity of mitotic phosphorylation sites and suggests that other kinases than cdk1 and plk1 also contribute to apc phosphorylation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276938	Ser378	AYHEGECsAVFEASG	Homo sapiens	HEK-293T Cell
pmid	sentence
26387737	Parkin Is Phosphorylated by Plk1 at Ser378 and Activated during Mitosis

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279552	Ser393	VCHDSDEsDTAKAVE	Homo sapiens
pmid	sentence
34051063	2.11 Plk1 Directly Phosphorylates DNMT3a at S393.\|Elevated Plk1 further inhibited DNMT3a via phosphorylation at S393 in mitosis in accord with its mitotic role during cell cycle.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-272994	Ser397	GKNQDFSsFDDTGKS	Homo sapiens	HeLa Cell
pmid	sentence
19509060	Here we report that the function of Nedd1 is regulated by Cdk1 and Plk1. During mitosis, Nedd1 is firstly phosphorylated at T550 by Cdk1, which creates a binding site for the polo-box domain of Plk1. Then, Nedd1 is further phosphorylated by Plk1 at four sites: T382, S397, S637 and S426. The sequential phosphorylation of Nedd1 by Cdk1 and Plk1 promotes its interaction with gamma-tubulin for targeting the gammaTuRC to the centrosome and is important for spindle formation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-272992	Ser426	VNKGSDEsIGKGDGF	Homo sapiens	HeLa Cell
pmid	sentence
19509060	Here we report that the function of Nedd1 is regulated by Cdk1 and Plk1. During mitosis, Nedd1 is firstly phosphorylated at T550 by Cdk1, which creates a binding site for the polo-box domain of Plk1. Then, Nedd1 is further phosphorylated by Plk1 at four sites: T382, S397, S637 and S426. The sequential phosphorylation of Nedd1 by Cdk1 and Plk1 promotes its interaction with gamma-tubulin for targeting the gammaTuRC to the centrosome and is important for spindle formation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-272991	Ser637	HSLLERYsVNEGLVA	Homo sapiens	HeLa Cell
pmid	sentence
19509060	Here we report that the function of Nedd1 is regulated by Cdk1 and Plk1. During mitosis, Nedd1 is firstly phosphorylated at T550 by Cdk1, which creates a binding site for the polo-box domain of Plk1. Then, Nedd1 is further phosphorylated by Plk1 at four sites: T382, S397, S637 and S426. The sequential phosphorylation of Nedd1 by Cdk1 and Plk1 promotes its interaction with gamma-tubulin for targeting the gammaTuRC to the centrosome and is important for spindle formation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-272993	Thr382	PRSINTDtLSKETDS	Homo sapiens	HeLa Cell
pmid	sentence
19509060	Here we report that the function of Nedd1 is regulated by Cdk1 and Plk1. During mitosis, Nedd1 is firstly phosphorylated at T550 by Cdk1, which creates a binding site for the polo-box domain of Plk1. Then, Nedd1 is further phosphorylated by Plk1 at four sites: T382, S397, S637 and S426. The sequential phosphorylation of Nedd1 by Cdk1 and Plk1 promotes its interaction with gamma-tubulin for targeting the gammaTuRC to the centrosome and is important for spindle formation.

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-125666	Ser4	sMDMDMSP	Homo sapiens	HeLa Cell
pmid	sentence
15190079	Phosphorylated at ser-4 by plk1 and plk2. Phosphorylation at ser-4 by plk2 in s phase is required for centriole duplication and is sufficient to trigger centriole replication. Phosphorylation at ser-4 by plk1 takes place during mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-249207	Ser426	CSLLLDSsLSSNWDD	Homo sapiens	HeLa Cell
pmid	sentence
12738781	These results suggest that Ser-426 is a major phosphorylation site by Plk1, and Thr-495 is a second major site.

Identifier	Residue	Sequence	Organism
SIGNOR-249208	Thr495	LLSLFEDtLDPT	Homo sapiens
pmid	sentence
12738781	These results suggest that Ser-426 is a major phosphorylation site by Plk1, and Thr-495 is a second major site.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-263096	Ser426	CSLLLDSsLSSNWDD	in vitro
pmid	sentence
12738781	Here, we have shown that Plk1 is responsible for part of the phosphorylation of Myt1 during M phase. The kinase activity of human Myt1 is reported to be decreased during M phase, and the decreased activity correlates with hyperphosphorylated forms of Myt1 (35, 37). We then tested the ability of these mutant forms of Myt1 (GST fusion proteins), to serve as a substrate for Plk1 in vitro. Quantification of the result (Fig. 5C) showed that Ser-426 is the major phosphorylation site by Plk1 in vitro and Thr-495 the second major site.

Identifier	Residue	Sequence	Organism
SIGNOR-263097	Thr495	LLSLFEDtLDPT	in vitro
pmid	sentence
12738781	Here, we have shown that Plk1 is responsible for part of the phosphorylation of Myt1 during M phase. The kinase activity of human Myt1 is reported to be decreased during M phase, and the decreased activity correlates with hyperphosphorylated forms of Myt1 (35, 37). We then tested the ability of these mutant forms of Myt1 (GST fusion proteins), to serve as a substrate for Plk1 in vitro. Quantification of the result (Fig. 5C) showed that Ser-426 is the major phosphorylation site by Plk1 in vitro and Thr-495 the second major site.

Publications:

2

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-166417	Ser435	RSIRRRDsCLNSKTK	Homo sapiens
pmid	sentence
20577264	In this study, we show that g2 and s-phase-expressed 1 (gtse1) protein, a negative regulator of p53, is required for g2 checkpoint recovery and that plk1 phosphorylation of gtse1 at ser 435 promotes its nuclear localization, and thus shuttles p53 out of the nucleus to lead to its degradation during the recovery.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-179461	Ser435	KKLKLISsDSED	Homo sapiens
pmid	sentence
18625707	Plk1 phosphorylation of trf1 is essential for its binding to telomeres

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-140898	Ser436	PTAALNEsLVECPKC	Homo sapiens
pmid	sentence
16198290	Upon mitotic entry, centrosome dissociation of cep55 is triggered by erk2/cdk1-dependent phosphorylation at s425 and s428. s425/428 phosphorylation is required for interaction with plk1, enabling phosphorylation of cep55 at s436...enabling it to relocate to the midbody to function in mitotic exit and cytokinesis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-273529	Ser437	QKAATVKsDIYSFSM	Homo sapiens
pmid	sentence
22405274	We show that phosphorylation of Tex14 by Plk1 during metaphase is required for proteosome dependent degradation of Tex14 and transition from metaphase to anaphase. Phosphorylation of Tex14 Ser431 by Plk1 promotes Tex14 depletion.

Identifier	Residue	Organism
SIGNOR-279646		Homo sapiens
pmid	sentence
22405274	In addition, we demonstrate that phosphorylation of Tex14 by Plk1 during metaphase promotes APC Cdc20 -mediated Tex14 degradation.

Publications:

2

Organism:

Homo Sapiens

Tissue:

Testis

Identifier	Residue	Sequence	Organism
SIGNOR-91344	Ser46	TEGNIDDsLIGGNAS	Homo sapiens
pmid	sentence
12167714	Plk phosphorylates tctp on two serine residues. These results suggest that phosphorylation decreases the microtubule-stabilizing activity of tctp and promotes the increase in microtubule dynamics that occurs after metaphase

Identifier	Residue	Sequence	Organism
SIGNOR-91348	Ser64	PEGEGTEsTVITGVD	Homo sapiens
pmid	sentence
12167714	Plk phosphorylates tctp on two serine residues. These results suggest that phosphorylation decreases the microtubule-stabilizing activity of tctp and promotes the increase in microtubule dynamics that occurs after metaphase

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279382	Ser467	DSPVFEDsKAKPEQR	Homo sapiens
pmid	sentence
27579997	As illustrated in , the turnover of nuclear SREBP1a was attenuated in the presence of Plk1, confirming that Plk1 stabilizes nuclear SREBP1 by reducing its degradation.\|Figure 2.Plk1 phosphorylates threonine 424, serine 467 and serine 486 in nuclear SREBP1 during mitosis. (A) In vitro kinase assay with recombinant nuclear SREBP1a and Plk1.

Identifier	Residue	Sequence	Organism
SIGNOR-279383	Ser486	SRGMLDRsRLALCTL	Homo sapiens
pmid	sentence
27579997	As illustrated in , the turnover of nuclear SREBP1a was attenuated in the presence of Plk1, confirming that Plk1 stabilizes nuclear SREBP1 by reducing its degradation.\|Figure 2.Plk1 phosphorylates threonine 424, serine 467 and serine 486 in nuclear SREBP1 during mitosis. (A) In vitro kinase assay with recombinant nuclear SREBP1a and Plk1.

Identifier	Residue	Sequence	Organism
SIGNOR-279381	Thr424	VKTEVEDtLTPPPSD	Homo sapiens
pmid	sentence
27579997	As illustrated in , the turnover of nuclear SREBP1a was attenuated in the presence of Plk1, confirming that Plk1 stabilizes nuclear SREBP1 by reducing its degradation.\|Plk1 phosphorylates T424, S467 and S486 in nuclear SREBP1 during mitosis.

Publications:

3

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-277885	Ser489	ENNFFNEsMNECRNW	in vitro
pmid	sentence
37988371	In this study, we demonstrate that PLK1 phosphorylates AHR at S489 in LUAD, leading to epithelial-mesenchymal transition (EMT) and metastatic events.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-178353	Ser49	EVLVDPRsRRRYVRG	Homo sapiens
pmid	sentence
18427546	We show here that pak1 is required for cell proliferation, mitotic progression and plk1 activity in hela cells. phosphorylation of plk1 on ser 49 is important for metaphase-associated events.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-178150	Ser497	SSNIQMDsGYNTQNC	Homo sapiens
pmid	sentence
18378770	Following cdk1-dependent recruitment, plk1 triggers hbora destruction by phosphorylating a recognition site for scf(beta-trcp).

Identifier	Residue	Sequence	Organism
SIGNOR-178803	Ser497	SSNIQMDsGYNTQNC	Homo sapiens
pmid	sentence
18521620	Following cdk1-dependent recruitment, plk1 triggers hbora destruction by phosphorylating a recognition site for scf(beta-trcp).

Identifier	Residue	Sequence	Organism
SIGNOR-178807	Thr501	QMDSGYNtQNCGSNI	Homo sapiens
pmid	sentence
18521620	Following cdk1-dependent recruitment, plk1 triggers hbora destruction by phosphorylating a recognition site for scf(beta-trcp).

Identifier	Residue	Sequence	Organism
SIGNOR-178154	Thr501	QMDSGYNtQNCGSNI	Homo sapiens
pmid	sentence
18378770	Following cdk1-dependent recruitment, plk1 triggers hbora destruction by phosphorylating a recognition site for scf(beta-trcp).

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-205577	Ser525	AGQKTPDsGHVSQEP	Homo sapiens
pmid	sentence
25329897	Plk1 phosphorylates ser525 in conserved 524dsghvs529 degron of rap1gap and promotes its interaction with _-trcp. Together, these results further support a model in which plk1, but not cdk1 or gsk-3_-mediated phosphorylation of rap1gap is a prerequisite for mitotic degradation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277913	Ser529	ILHLSNGsVQINFFQ	Homo sapiens	HeLa Cell
pmid	sentence
37596441	Chk1 directly phosphorylates Plk1 to disturb its interaction with Sgo1.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277914	Thr539	INFFQDHtKLILCPL	Homo sapiens	HeLa Cell
pmid	sentence
37596441	Chk1 directly phosphorylates Plk1 to disturb its interaction with Sgo1.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276040	Ser53	GHSTGEDsAFQEPDS	Homo sapiens	HeLa Cell
pmid	sentence
16085715	In the present study, we show that phosphorylation of S123 (pS123) by CDK promoted the binding of Wee1A to beta-TrCP through three independent mechanisms. S123 phosphorylation creates a PBD-binding motif and accelerates S53 phosphorylation by Plk1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence
SIGNOR-275557	Ser539	RPKRTKAsMSEFLES
pmid	sentence
25855382	PLK1 and HOTAIR Accelerate Proteasomal Degradation of SUZ12 and ZNF198 during Hepatitis B Virus-Induced Liver Carcinogenesis\|In SUZ12, residues 539, 541 and 546 phosphorylated by Plk1 in vitro

Identifier	Residue	Sequence
SIGNOR-275555	Ser541	KRTKASMsEFLESED
pmid	sentence
25855382	PLK1 and HOTAIR Accelerate Proteasomal Degradation of SUZ12 and ZNF198 during Hepatitis B Virus-Induced Liver Carcinogenesis\|In SUZ12, residues 539, 541 and 546 phosphorylated by Plk1 in vitro

Identifier	Residue	Sequence
SIGNOR-275556	Ser546	SMSEFLEsEDGEVEQ
pmid	sentence
25855382	PLK1 and HOTAIR Accelerate Proteasomal Degradation of SUZ12 and ZNF198 during Hepatitis B Virus-Induced Liver Carcinogenesis\|In SUZ12, residues 539, 541 and 546 phosphorylated by Plk1 in vitro

Publications:

3

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276501	Ser564	KTYSLSSsFSSSSST	Homo sapiens	HEK-293T Cell
pmid	sentence
23977272	Further analysis indicated that Plk1 could phosphorylate cyclin T1 at Ser564 and inhibit the kinase activity of cyclin T1/Cdk9 complex on phosphorylation of the C-terminal domain (CTD) of RNA polymerase II.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-160751	Ser57	SQSSQDSsPVRNLQS	Homo sapiens
pmid	sentence
18250300	Here, we show that the interaction between plk1 and hbo1 is mitosis-specific and that plk1 phosphorylates hbo1 on ser-57 in vitro and in vivo. During mitosis, cdk1 phosphorylates hbo1 on thr-85/88, creating a docking site for plk1 to be recruited. Significantly, the overexpression of hbo1 mutated at the plk1 phosphorylation site (s57a) leads to cell-cycle arrest in the g1/s phase, inhibition of chromatin loading of the minichromosome maintenance (mcm) complex, and a reduced dna replication rate.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276862	Ser621	ALIPGNLsKEEEELS	Homo sapiens	HeLa Cell
pmid	sentence
25504441	Our studies suggest new mechanisms by which Plk1 regulates MCAK: the degradation of MCAK is controlled by Plk1 phosphorylation on S621, whereas its activity is modulated by Plk1 phosphorylation on S632/S633 in mitosis.We have recently shown that S621 in MCAK is the major phosphorylation site of Plk1, which is responsible for regulating MCAK's degradation by promoting the association of MCAK with APC/CCdc20. In the present study, we have addressed another two residues phosphorylated by Plk1, namely S632/S633 in the C-terminus of MCAK. Our data suggest that Plk1 phosphorylates S632/S633 and regulates its catalytic activity in mitosis. This phosphorylation is required for proper spindle assembly during early phases of mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276863	Ser632	EELSSQMsSFNEAMT	Homo sapiens	HeLa Cell
pmid	sentence
25504441	Our studies suggest new mechanisms by which Plk1 regulates MCAK: the degradation of MCAK is controlled by Plk1 phosphorylation on S621, whereas its activity is modulated by Plk1 phosphorylation on S632/S633 in mitosis.We have recently shown that S621 in MCAK is the major phosphorylation site of Plk1, which is responsible for regulating MCAK's degradation by promoting the association of MCAK with APC/CCdc20. In the present study, we have addressed another two residues phosphorylated by Plk1, namely S632/S633 in the C-terminus of MCAK. Our data suggest that Plk1 phosphorylates S632/S633 and regulates its catalytic activity in mitosis. This phosphorylation is required for proper spindle assembly during early phases of mitosis.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276861	Ser633	ELSSQMSsFNEAMTQ	Homo sapiens	HeLa Cell
pmid	sentence
25504441	Our studies suggest new mechanisms by which Plk1 regulates MCAK: the degradation of MCAK is controlled by Plk1 phosphorylation on S621, whereas its activity is modulated by Plk1 phosphorylation on S632/S633 in mitosis.We have recently shown that S621 in MCAK is the major phosphorylation site of Plk1, which is responsible for regulating MCAK's degradation by promoting the association of MCAK with APC/CCdc20. In the present study, we have addressed another two residues phosphorylated by Plk1, namely S632/S633 in the C-terminus of MCAK. Our data suggest that Plk1 phosphorylates S632/S633 and regulates its catalytic activity in mitosis. This phosphorylation is required for proper spindle assembly during early phases of mitosis.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276931	Ser715	MQLEEQAsRQISSKK	Homo sapiens	HEK-293T Cell
pmid	sentence
26206521	Active PLK1, in turn, phosphorylates MCAK at Ser715 which promotes its microtubule depolymerase activity essential for faithful chromosome segregation.

Identifier	Residue	Organism
SIGNOR-278908		Homo sapiens
pmid	sentence
21078677	PLK1 phosphorylates mitotic centromere-associated kinesin and promotes its depolymerase activity.

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-265943	Ser649	EVIEVDEsDVEEDIF	Homo sapiens	U2-OS Cell
pmid	sentence
28512243	Plk1 phosphorylates Mre11 at S649.Mre11 phosphorylation at S649/S688 inhibits its binding to dsDNA and antagonizes the ATM signaling.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-139919	Ser65	SHLLVKHsQSRRPSS	Homo sapiens	HeLa Cell
pmid	sentence
16118204	Here we demonstrate that ser-65 in pin1 is the major site for plk1-specific phosphorylation, and the polo-box domain of plk1 is required for this phosphorylation. Interestingly, the phosphorylation of pin1 by plk1 does not affect its isomerase activity but rather is linked to its protein stability. pin1 is ubiquitinated in hela s3 cells, and substitution of glu for ser-65 reduces the ubiquitination of pin1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-157646	Ser676	LSPIIEDsREATHSS	Homo sapiens
pmid	sentence
17785528	We identify s676 as a plk1-specific phosphorylation site on bubr1. These findings describe the first in vivo verified phosphorylation site for human bubr1, identify plk1 as the kinase responsible for causing the characteristic mitotic bubr1 upshift, and attribute a kt-specific function to the hyperphosphorylated form of bubr1 in the stabilization of kt-mt interactions.

Identifier	Residue	Sequence	Organism
SIGNOR-153863	Thr1008	LNANDEAtVSVLGEL	Homo sapiens
pmid	sentence
17376779	Bubr1 was phosphorylated by plk1 in vitro at two plk1 consensus sites in the kinase domain of bubr1

Identifier	Residue	Sequence	Organism
SIGNOR-199222	Thr680	IEDSREAtHSSGFSG	Homo sapiens
pmid	sentence
23079597	Phosphorylation of kard by plk1 promotes direct interaction of bubr1 with the pp2a-b56_ phosphatase that counters excessive aurora b activity at kinetochores. We propose that plk1 and bubr1 cooperate to stabilize kinetochore-microtubule interactions. Phosphorylation of t680 by plk1 is essential for kard function

Identifier	Residue	Sequence	Organism
SIGNOR-153867	Thr792	PRNSAELtVIKVSSQ	Homo sapiens
pmid	sentence
17376779	Bubr1 was phosphorylated by plk1 in vitro at two plk1 consensus sites in the kinase domain of bubr1

Publications:

4

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-273730	Ser686	RSDVFRDsFSHSPGA	Homo sapiens	HEK-293 Cell
pmid	sentence
30297404	PLK1 Phosphorylates MMAP to Promote Its Interaction with KIF2A and MRE11. we performed in vitro kinase assays followed by mass spectrometry and found that two sites (S686 and S695) in this cluster were phosphorylated. Thus, all of these results are in agreement that this cluster is phosphorylated by PLK1.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-273731	Ser695	SHSPGAVsSLKVFTG	Homo sapiens	HEK-293 Cell
pmid	sentence
30297404	PLK1 Phosphorylates MMAP to Promote Its Interaction with KIF2A and MRE11. we performed in vitro kinase assays followed by mass spectrometry and found that two sites (S686 and S695) in this cluster were phosphorylated. Thus, all of these results are in agreement that this cluster is phosphorylated by PLK1.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-103348	Ser686	LEELHEKsQEVIWGL	in vitro
pmid	sentence
12852856	Here, we identify a centrosomal plk1 substrate, termed nlp (ninein-like protein), whose properties suggest an important role in microtubule organization. Nlp interacts with two components of the gamma-tubulin ring complex and stimulates microtubule nucleation. Plk1 phosphorylates nlp and disrupts both its centrosome association and its gamma-tubulin interaction

Identifier	Residue	Sequence	Organism
SIGNOR-103352	Ser87	VRPSDEDsSSLESAA	in vitro
pmid	sentence
12852856	Here, we identify a centrosomal plk1 substrate, termed nlp (ninein-like protein), whose properties suggest an important role in microtubule organization. Nlp interacts with two components of the gamma-tubulin ring complex and stimulates microtubule nucleation. Plk1 phosphorylates nlp and disrupts both its centrosome association and its gamma-tubulin interaction

Identifier	Residue	Sequence	Organism
SIGNOR-103356	Ser88	RPSDEDSsSLESAAS	in vitro
pmid	sentence
12852856	Here, we identify a centrosomal plk1 substrate, termed nlp (ninein-like protein), whose properties suggest an important role in microtubule organization. Nlp interacts with two components of the gamma-tubulin ring complex and stimulates microtubule nucleation. Plk1 phosphorylates nlp and disrupts both its centrosome association and its gamma-tubulin interaction

Identifier	Residue	Sequence	Organism
SIGNOR-103364	Thr161	SDEEAEStKEAQNEL	in vitro
pmid	sentence
12852856	Here, we identify a centrosomal plk1 substrate, termed nlp (ninein-like protein), whose properties suggest an important role in microtubule organization. Nlp interacts with two components of the gamma-tubulin ring complex and stimulates microtubule nucleation. Plk1 phosphorylates nlp and disrupts both its centrosome association and its gamma-tubulin interaction

Publications:

4

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-185838	Ser718	KDRDGYEsSYRRRTL	Homo sapiens
pmid	sentence
19473992	Plk1-mediated phosphorylation of topors regulates p53 stabilityherein, we have identified topoisomerase i-binding protein (topors), a p53-binding protein, as a plk1 target. We show that plk1 phosphorylates topors on ser(718) in vivo. Significantly, expression of a plk1-unphosphorylatable topors mutant (s718a) leads to a dramatic accumulation of p53 through inhibition of p53 degradation. Topors is an ubiquitin and small ubiquitin-like modifier ubiquitin-protein isopeptide ligase (sumo e3) ligase. Plk1-mediated phosphorylation of topors inhibits topors-mediated sumoylation of p53, whereas p53 ubiquitination is enhanced, leading to p53 degradation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-182150	Ser718	QDDPSYRsFHSGGYG	Homo sapiens
pmid	sentence
19001871	Ser-718 of beta-catenin was directly phosphorylated by recombinant plk1thus it may be possible that function of the additional phosphorylation site(s) in cooperation with the ser-718 is required for the regulation of _-catenin at m phase

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-187888	Ser730	VLDTMNDsLSKILLD	Homo sapiens
pmid	sentence
19737929	It has been reported that plk1 could directly phosphorylate foxm1 at ser-715 and ser-724 for full activation and proper mitotic progression

Identifier	Residue	Sequence	Organism
SIGNOR-187892	Ser739	SKILLDIsFPGLDED	Homo sapiens
pmid	sentence
19737929	It has been reported that plk1 could directly phosphorylate foxm1 at ser-715 and ser-724 for full activation and proper mitotic progression

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-181798	Ser733	TVREQDQsFTALDWS	Homo sapiens
pmid	sentence
18957422	Plk1 phosphorylates serines 733, 740, and 750 in the gammabd of ikkbeta in vitro. Phosphorylating gammabd with plk1 decreased its affinity for ikkgamma

Identifier	Residue	Sequence	Organism
SIGNOR-181802	Ser740	SFTALDWsWLQTEEE	Homo sapiens
pmid	sentence
18957422	Plk1 phosphorylates serines 733, 740, and 750 in the gammabd of ikkbeta in vitro. Phosphorylating gammabd with plk1 decreased its affinity for ikkgamma

Identifier	Residue	Sequence	Organism
SIGNOR-181806	Ser750	QTEEEEHsCLEQAS	Homo sapiens
pmid	sentence
18957422	Plk1 phosphorylates serines 733, 740, and 750 in the gammabd of ikkbeta in vitro. Phosphorylating gammabd with plk1 decreased its affinity for ikkgamma

Publications:

3

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-176122	Ser77	QVENLASsLQLITEC	Homo sapiens
pmid	sentence
21857149	Phosphorylation of ataxin-10 by polo-like kinase 1 is required for cytokinesis. Plk1 phosphorylates ataxin-10 at s77 and t82 in vitro. we found that ataxin-10 is ubiquitinated, and is subject to proteasome-dependent degradation, which is delayed in the 2a mutant. We propose a model in which plk1 phosphorylation of ataxin-10 influences its degradation and cytokinesis

Identifier	Residue	Sequence	Organism
SIGNOR-176126	Thr82	ASSLQLItECFRCLR	Homo sapiens
pmid	sentence
21857149	Phosphorylation of ataxin-10 by polo-like kinase 1 is required for cytokinesis. Plk1 phosphorylates ataxin-10 at s77 and t82 in vitro. we found that ataxin-10 is ubiquitinated, and is subject to proteasome-dependent degradation, which is delayed in the 2a mutant. We propose a model in which plk1 phosphorylation of ataxin-10 influences its degradation and cytokinesis

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-150453	Ser77	TFDPPLHsTAIYADE	Homo sapiens
pmid	sentence
17081991	S77 and t78 of pbip1 are important for plk1-dependent pbip1 phosphorylation and degradation. Here, we demonstrate that a pbd-binding protein, pbip1, is crucial for recruiting plk1 to the interphase and mitotic kinetochores. Unprecedentedly, plk1 phosphorylated pbip1 at t78. Later in mitosis, plk1 also induced pbip1 degradation in a t78-dependent manner, thereby enabling itself to interact with other components critical for proper kinetochore functions

Identifier	Residue	Sequence	Organism
SIGNOR-150457	Thr78	FDPPLHStAIYADEE	Homo sapiens
pmid	sentence
17081991	S77 and t78 of pbip1 are important for plk1-dependent pbip1 phosphorylation and degradation. Here, we demonstrate that a pbd-binding protein, pbip1, is crucial for recruiting plk1 to the interphase and mitotic kinetochores. Unprecedentedly, plk1 phosphorylated pbip1 at t78. Later in mitosis, plk1 also induced pbip1 degradation in a t78-dependent manner, thereby enabling itself to interact with other components critical for proper kinetochore functions

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-159386	Ser83	GVRLLQDsVDFSLAD	Homo sapiens	Breast Cancer Cell
pmid	sentence
18056432	We observed that plk1 phosphorylates vimentin on ser82, which in turn regulates cell surface levels of 1 integrin.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276242	Ser978	VVSASLIsPASTPSC	Homo sapiens	HeLa Cell
pmid	sentence
21818122	Here, we report that Plk1 forms a complex with TNKS1 in vitro and in vivo, and phosphorylates TNKS1. Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity. By contrast, targeted inhibition of Plk1 or mutation of phosphorylation sites decreased the stability and PARP activity of TNKS1, leading to distort mitotic spindle-pole assembly and telomeric ends.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276244	Thr1128	VEEEMQStIREHRDG	Homo sapiens	HeLa Cell
pmid	sentence
21818122	Here, we report that Plk1 forms a complex with TNKS1 in vitro and in vivo, and phosphorylates TNKS1. Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity. By contrast, targeted inhibition of Plk1 or mutation of phosphorylation sites decreased the stability and PARP activity of TNKS1, leading to distort mitotic spindle-pole assembly and telomeric ends.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276245	Thr839	DTQGRNStPLHLAAG	Homo sapiens	HeLa Cell
pmid	sentence
21818122	Here, we report that Plk1 forms a complex with TNKS1 in vitro and in vivo, and phosphorylates TNKS1. Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity. By contrast, targeted inhibition of Plk1 or mutation of phosphorylation sites decreased the stability and PARP activity of TNKS1, leading to distort mitotic spindle-pole assembly and telomeric ends.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276243	Thr930	LAHGADPtMKNQEGQ	Homo sapiens	HeLa Cell
pmid	sentence
21818122	Here, we report that Plk1 forms a complex with TNKS1 in vitro and in vivo, and phosphorylates TNKS1. Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity. By contrast, targeted inhibition of Plk1 or mutation of phosphorylation sites decreased the stability and PARP activity of TNKS1, leading to distort mitotic spindle-pole assembly and telomeric ends.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276241	Thr982	SLISPAStPSCLSAA	Homo sapiens	HeLa Cell
pmid	sentence
21818122	Here, we report that Plk1 forms a complex with TNKS1 in vitro and in vivo, and phosphorylates TNKS1. Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity. By contrast, targeted inhibition of Plk1 or mutation of phosphorylation sites decreased the stability and PARP activity of TNKS1, leading to distort mitotic spindle-pole assembly and telomeric ends.

Identifier	Residue	Organism
SIGNOR-279752		Homo sapiens
pmid	sentence
21818122	Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity.

Publications:

6

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279550	Thr107	RHYMRFQtPEPDNHY	Homo sapiens
pmid	sentence
30367032	In addition, the inhibition of PLK1 activity by BI2536 treatment sharply reduced BEX4 protein, which was localized at the centrosomes in the HeLa cells or the GFP-BEX4 stable cell lines.\|PLK1 directly phosphorylates BEX4 at T107 and contributes to BEX4-induced aneuploidy.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-276122	Thr151	RSYSRLEtLGSASTS	in vitro
pmid	sentence
23901111	Here we show that the mitotic kinases Aurora B and Cyclin-dependent kinase 1 (Cdk1) destabilize interactions between Sororin and the cohesin subunit precocious dissociation of sisters protein 5 (Pds5) by phosphorylating Sororin, leading to release of acetylated cohesin from chromosome arms and loss of cohesion.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-203732	Thr155	YSTNGKItFDDYIAC	Homo sapiens
pmid	sentence
24427308	Sorcin interacts physically with plk1, is phosphorylated by plk1 and induces plk1 autophosphorylation, thereby regulating kinase activity.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-278422	Thr183	TLLMKKDtLTEEETQ	Homo sapiens
pmid	sentence
26057687	Our findings illustrate a unique molecular mechanism underlying PLK1 dependent inactivation of NDR1 and define a novel role for PLK1-NDR1 signaling cascade in governing accurate spindle orientation to ensure faithful chromosome segregation in mitosis.\|PLK1 phosphorylates NDR1 at three putative threonine residues (T7, T183 and T407) at mitotic entry, which elicits PLK1 dependent suppression of NDR1 activity and ensures correct spindle orientation in mitosis.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276913	Thr183	TLLMKKDtLTEEETQ	Homo sapiens	HeLa Cell
pmid	sentence
26057687	Here, we identified a conserved signaling axis in which NDR1 kinase activity is regulated by PLK1 in mitosis. PLK1 phosphorylates NDR1 at three putative threonine residues (T7, T183 and T407) at mitotic entry, which elicits PLK1-dependent suppression of NDR1 activity and ensures correct spindle orientation in mitosis.

Identifier	Residue	Sequence	Organism
SIGNOR-278421	Thr407	EIKSIDDtSNFDEFP	Homo sapiens
pmid	sentence
26057687	Our findings illustrate a unique molecular mechanism underlying PLK1 dependent inactivation of NDR1 and define a novel role for PLK1-NDR1 signaling cascade in governing accurate spindle orientation to ensure faithful chromosome segregation in mitosis.\|PLK1 phosphorylates NDR1 at three putative threonine residues (T7, T183 and T407) at mitotic entry, which elicits PLK1 dependent suppression of NDR1 activity and ensures correct spindle orientation in mitosis.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276915	Thr407	EIKSIDDtSNFDEFP	Homo sapiens	HeLa Cell
pmid	sentence
26057687	Here, we identified a conserved signaling axis in which NDR1 kinase activity is regulated by PLK1 in mitosis. PLK1 phosphorylates NDR1 at three putative threonine residues (T7, T183 and T407) at mitotic entry, which elicits PLK1-dependent suppression of NDR1 activity and ensures correct spindle orientation in mitosis.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-276914	Thr7	tPCSSMSN	Homo sapiens	HeLa Cell
pmid	sentence
26057687	Here, we identified a conserved signaling axis in which NDR1 kinase activity is regulated by PLK1 in mitosis. PLK1 phosphorylates NDR1 at three putative threonine residues (T7, T183 and T407) at mitotic entry, which elicits PLK1-dependent suppression of NDR1 activity and ensures correct spindle orientation in mitosis.

Identifier	Residue	Sequence	Organism
SIGNOR-278420	Thr7	tPCSSMSN	Homo sapiens
pmid	sentence
26057687	Our findings illustrate a unique molecular mechanism underlying PLK1 dependent inactivation of NDR1 and define a novel role for PLK1-NDR1 signaling cascade in governing accurate spindle orientation to ensure faithful chromosome segregation in mitosis.\|PLK1 phosphorylates NDR1 at three putative threonine residues (T7, T183 and T407) at mitotic entry, which elicits PLK1 dependent suppression of NDR1 activity and ensures correct spindle orientation in mitosis.

Publications:

6

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277591	Thr197	ASTETYStPALLAPS	Homo sapiens	HEK-293T Cell
pmid	sentence
35437307	We observed that PLK1 could significantly promote the ubiquitination and degradation of Smad4 wild type, Smad4 S171A, Smad4 S187A, Smad4 S191A, respectively, but PLK1-induced the ubiquitination and degradation of Smad4 T197A were obviously inhibited (Fig. 1M).

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-167858	Thr206	MTSELEStSLGDSDE	Homo sapiens
pmid	sentence
20823832	Dvl2 bound to and was phosphorylated at thr206 by a mitotic kinase, polo-like kinase 1 (plk1), and this phosphorylation was required for spindle orientation and stable microtubule (mt)-kt attachment

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-273888	Thr210	SEYSMAEtLVGTPYY	Homo sapiens	HeLa Cell
pmid	sentence
21642957	We now identify Plk1 as Nek9 direct activator and propose a two-step activation mechanism that involves Nek9 sequential phosphorylation by CDK1 and Plk1. while CDK1 activity is necessary for Nek9 phosphorylation in mitosis and the resulting change in electrophoretical mobility, Nek9 Thr210 phosphorylation and mitotic activation requires both CDK1 and Plk1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-92274	Thr210	YDGERKKtLCGTPNY	Homo sapiens	HeLa Cell
pmid	sentence
12207013	Xplkk1 phosphorylates and activates mammalian plk / xplkk1 phosphorylates thr-210

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279358	Thr210	YDGERKKtLCGTPNY	Homo sapiens
pmid	sentence
26206521	Aurora B phosphorylates PLK1 on Thr210 to activate its kinase activity at the kinetochores during mitosis.\|Thus, we conclude that Aurora B indirectly promotes the phosphorylation of MCAK on Ser715 at the kinetochores through phosphorylation of PLK1 at Thr210 and its ensuing activation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-179422	Thr210	YDGERKKtLCGTPNY	Homo sapiens
pmid	sentence
18615013	We find that aurora a (aurka) can directly phosphorylate plk1 on thr 210;activation of plk1 requires phosphorylation of a conserved threonine residue (thr 210).

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-279749	Thr210	YDGERKKtLCGTPNY	Homo sapiens
pmid	sentence
24771642	This data strongly indicates that Pim1 phosphorylates PLK1 at threonine 210, a site previously reported to be phosphorylated by aurora A kinase during mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-280212	Thr210	YDGERKKtLCGTPNY	Homo sapiens
pmid	sentence
33402344	Thus, CycA2-CDK2 can stimulate phosphorylation of PLK1 T210 in vitro and the interactions required for CycA2-mediated PLK1 T210 phosphorylation are detected in the cytoplasm, but not in the nucleus.\|We find that Cyclin A2-CDK2 can activate the mitotic kinase PLK1 through phosphorylation of Bora, and that only cytoplasmic Cyclin A2 interacts with Bora and PLK1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-198353	Thr2229	QAEEREHtLRRCQQE	Homo sapiens
pmid	sentence
22820163	Here we show that tara is a novel polo-like kinase 1 (plk1) target protein. Plk1 interacts with and phosphorylates tara in vivo and in vitro. Actually, the thr-457 in tara was a bona fide in vivo phosphorylation site for plk1. Interestingly, we found that the centrosomal localization of tara depended on the thr-457 phosphorylation and the kinase activity of plk1

Identifier	Residue	Sequence	Organism
SIGNOR-198357	Thr447	ASSPSRAtRDNPTTS	Homo sapiens
pmid	sentence
22820163	Here we show that tara is a novel polo-like kinase 1 (plk1) target protein. Plk1 interacts with and phosphorylates tara in vivo and in vitro. Actually, the thr-457 in tara was a bona fide in vivo phosphorylation site for plk1. Interestingly, we found that the centrosomal localization of tara depended on the thr-457 phosphorylation and the kinase activity of plk1

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-249180	Thr26	SQPHGSVtQSQGSSS	in vitro
pmid	sentence
12493754	Plk1 overexpression enhances phosphorylation of Chk2 at Thr-68. Plk1 phosphorylates recombinant Chk2 in vitro.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism
SIGNOR-178253	Thr27	SSLEPDStYFDLPQS	Homo sapiens
pmid	sentence
18418051	P73-mediated transcriptional activity is negatively regulated by polo-like kinase 1. tap73 is phosphorylated by this kinase on threonine-27 (thr-27) within the ta domain.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-169184	Thr37	SDAKLEPtNVQTVTC	Homo sapiens
pmid	sentence
21041660	Binding between cdc6 and plk1 occurs through the polo-box domain of plk1, and cdc6 is phosphorylated by plk1 on t37. These results suggest that plk1-mediated phosphorylation of cdc6 promotes the interaction of cdc6 and cdk1, leading to the attenuation of cdk1 activity, release of separase, and subsequent anaphase progression.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-149630	Thr379	WSTSSDLtISISEDD	Homo sapiens
pmid	sentence
16980960	Here, we identify a novel centrosomal substrate of plk1, kizuna (kiz), depletion of which causes fragmentation and dissociation of the pericentriolar material from centrioles at prometaphase, resulting in multipolar spindles. Plk1 maintains the integrity of the spindle poles by phosphorylating kiz.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-200087	Thr39	PVETIETtVVGEEEE	Homo sapiens
pmid	sentence
23226345	More recently, we identified and mapped multiple phosphorylation sites in yy1, including, threonine 39, serine 118, serine 247, threonine 348 and threonine 378. The first kinase proven to phosphorylate yy1 in vivo was plk1, which phosphorylates threonine 39 during g2/m stage of the cell cycle [25]. Ck2_ is another kinase identified as constitutively phosphorylating yy1 at serine 118. This modification protects yy1 cleavage by caspase 7 during apoptosis

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-267580	Thr406	AVYTKMMtKKPGMFF	Homo sapiens	HEK-293 Cell
pmid	sentence
29138396	We find that Plk1 interacts with and directly phosphorylates glucose-6-phosphate dehydrogenase (G6PD). By activating G6PD through promoting the formation of its active dimer, Plk1 increases PPP flux and directs glucose to the synthesis of macromolecules.\|the kinase domain of Plk1 phosphorylates T406, T466 of G6PD

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-267581	Thr466	REAWRIFtPLLHQIE	Homo sapiens	HEK-293 Cell
pmid	sentence
29138396	We find that Plk1 interacts with and directly phosphorylates glucose-6-phosphate dehydrogenase (G6PD). By activating G6PD through promoting the formation of its active dimer, Plk1 increases PPP flux and directs glucose to the synthesis of macromolecules.\|the kinase domain of Plk1 phosphorylates T406, T466 of G6PD

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-266405	Thr44	GLPVAVStLARDRSS	Homo sapiens	HEK-293 Cell
pmid	sentence
26012549	In the presence of AurA binding, Plk1 preferentially phosphorylates and interacts with the T44 motif of Cep192 through the “self-priming and binding” mechanism

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-278380	Thr554	ANRVKELtVDPTAAG	Homo sapiens
pmid	sentence
25660017	Taken together, KIF2A is phosphorylated at T554 by PLK1 in the subdistal appendages of the mother centriole, which enhances MT depolymerization to disassemble primary cilia in a growth-signal-dependent manner.\|Thus, PLK1 and APC/C mediated dual regulation connect the MT depolymerizing activity of KIF2A to a physiological primary cilia disassembly during the proliferative phase.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-179954	Thr574	HLVVTEDtDEDAPLV	Homo sapiens	HeLa Cell
pmid	sentence
18694934	We reported previously that a guanine nucleotide exchange factor, myogef, localizes to the central spindle, activates rhoa, and is required for cytokinesis. In this study, we have found that plk1 (polo-like kinase 1) can phosphorylate myogef, thereby recruiting myogef to the central spindle as well as enhancing myogef activity toward rhoa. The in vitro kinase assay shows that plk1 can phosphorylate myogef on threonine 574.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-273728	Thr601	EVRELLAtLEGLDLD	Mus musculus	Hepatoma Cell Line
pmid	sentence
32060423	PLK1, an important regulator for cell mitosis, directly interacts with and phosphorylates PARP10 at T601. PARP10 phosphorylation at T601 significantly decreases its binding to NEMO and disrupts its inhibition to NEMO ubiquitination, thereby enhancing the transcription activity of NF-κB toward multiple target genes and promoting HCC development.

Publications:

1

Organism:

Mus Musculus

Identifier	Residue	Sequence	Organism
SIGNOR-96637	Thr68	SSLETVStQELYSIP	Homo sapiens
pmid	sentence
12493754	Plk1 overexpression enhances phosphorylation of chk2 at thr-68.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-276173	Thr680	SKMQLLEtEFSHTVG	in vitro
pmid	sentence
18922800	These findings indicate mechanistic roles contributed by protein phosphorylation and Plk1 to the SAC activity of Mad1.Here, we have studied the phosphorylation of Mad1 and mapped using liquid chromatography-tandem mass spectrometry several phosphorylated amino acids in this protein. One phosphorylated residue, Thr680, was characterized to be important for the kinetochore localization of Mad1 and its SAC function.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277883	Thr7	tAEQLAQI	Homo sapiens	HeLa Cell
pmid	sentence
38355643	PLK1 phosphorylates RhoGDI1 at Thr7/91 residue in vitro and in vivo. Collectively, we demonstrate that the phosphorylation of RhoGDI1 by PLK1 promotes cancer cell migration and invasion through RhoA activation.

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-277882	Thr91	GPLELDLtGDLESFK	Homo sapiens	HeLa Cell
pmid	sentence
38355643	PLK1 phosphorylates RhoGDI1 at Thr7/91 residue in vitro and in vivo. Collectively, we demonstrate that the phosphorylation of RhoGDI1 by PLK1 promotes cancer cell migration and invasion through RhoA activation.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism
SIGNOR-260935	Tyr425	SDKYGLGyQLCDNSV	Homo sapiens
pmid	sentence
27899378	C-ABL can directly phosphorylate PLK1 and activate PLK1. \| The above results indicate that c-ABL–mediated PLK1 Y425 phosphorylation regulates PLK1 ubiquitination and stability.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-278269		Homo sapiens
pmid	sentence
32704044	In conclusion, we provide evidence that PLK1-dependent phosphorylation of FOXO1 induces its nuclear exclusion and negatively regulates FOXO1 transcriptional activity in PCa.\|We previously demonstrated that PLK1 inhibits the transcriptional activity of FOXO1 by promoting its nuclear exclusion in U2OS cells .

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-192991		Homo sapiens
pmid	sentence
Other

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-262731		Homo sapiens	U2-OS Cell
pmid	sentence
27065329	Here, we found that centrosomal protein of 76 kDa (Cep76), previously shown to restrain centriole amplification, interacts with cyclin-dependent kinase 2 (CDK2) and is a bona fide substrate of this kinase. Cep76 is preferentially phosphorylated by cyclin A/CDK2 at a single site S83, and this event is crucial to suppress centriole amplification in S phase. Mechanistically, Cep76 phosphorylation inhibits activation of polo-like kinase 1 (Plk1), thereby blocking premature centriole disengagement and subsequent amplification.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-129813		Homo sapiens
pmid	sentence
15469984	Plk1 regulates activation of the anaphase promoting complex by phosphorylating and triggering scfbetatrcp-dependent destruction of the apc inhibitor emi1.

Identifier	Residue	Organism
SIGNOR-142949		Homo sapiens
pmid	sentence
16439210	We propose that the balance of evi5 and polo-like kinase activities determines the timely accumulation of emi1 and cyclin, ensuring mitotic fidelity.

Publications:

2

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-272108		in vitro
pmid	sentence
23455478	Here, we identify PLK1 as a target of the cullin 3 (CUL3)-based E3 ubiquitin ligase, containing the BTB adaptor KLHL22, which regulates chromosome alignment and PLK1 kinetochore localization but not PLK1 stability. In the absence of KLHL22, PLK1 accumulates on kinetochores, resulting in activation of the spindle assembly checkpoint (SAC). CUL3-KLHL22 ubiquitylates Lys 492, located within the PBD, leading to PLK1 dissociation from kinetochore phosphoreceptors.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Organism
SIGNOR-185841		Homo sapiens
pmid	sentence
19473992	Plk1-mediated phosphorylation of topors regulates p53 stability. Herein, we have identified topoisomerase i-binding protein (topors), a p53-binding protein, as a plk1 target. We show that plk1 phosphorylates topors on ser(718) in vivo. Significantly, expression of a plk1-unphosphorylatable topors mutant (s718a) leads to a dramatic accumulation of p53 through inhibition of p53 degradation. Topors is an ubiquitin and small ubiquitin-like modifier ubiquitin-protein isopeptide ligase (sumo e3) ligase. Plk1-mediated phosphorylation of topors inhibits topors-mediated sumoylation of p53, whereas p53 ubiquitination is enhanced, leading to p53 degradation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-275421		Homo sapiens	HeLa Cell
pmid	sentence
24413556	Phosphorylation by Cyclin B-Cdk1 allows Haspin to bind Plk1-PBD. Phosphorylation of Haspin at T128 and Plk1 target sites is required for full H3T3ph generation and normal Aurora B localization in mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279252		Homo sapiens
pmid	sentence
29065306	Collectively, these data show that mitotic hyperphosphorylation of Nup53 by CDK1 and PLK1 contributes to its removal from NPCs.\|The combined mutation of the CDK1 and PLK1 sites to phosphomimetic residues almost completely abolished NPC integration of Nup53, indicating that hyperphosphorylation of Nup53 might be incompatible with its NPC association.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-143683		Homo sapiens
pmid	sentence
16439210	Evi5 antagonizes scf(betatrcp)-dependent emi1 ubiquitination and destruction by binding to a site adjacent to emi1's dsgxxs degron and blocking both degron phosphorylation by polo-like kinases and subsequent betatrcp binding.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279645		Homo sapiens
pmid	sentence
22621898	Plk1 negatively regulates PRC1 to prevent premature midzone formation before cytokinesis.\|Plk1, but not Cdk1, phosphorylates PRC1 on Thr-602 to prevent premature midzone assembly in metaphase.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-273589		Homo sapiens
pmid	sentence
26259146	Moreover, CDK1 phosphorylates RSF1 at Ser1375, and this phosphorylation is necessary for PLK1 recruitment. Subsequently, PLK1 phosphorylates RSF1 at Ser1359, stabilizing PLK1 deposition.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-278201		Homo sapiens
pmid	sentence
12939256	MKlp2 treated with Plk1 did not form the regular microtubule bundles seen with MKlp2 only; many single microtubules were seen instead, and the bundles that were formed were loose parallel arrays rather than the dense bundles seen with untreated MKlp2.\|We propose that phosphorylation of MKlp2 by Plk1 is necessary for the spatial restriction of Plk1 to the central spindle during anaphase and telophase, and the complex of these two proteins is required for cytokinesis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-193309		Homo sapiens
pmid	sentence
Other

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-267560
pmid	sentence
21640712	These data indicated that PLK1 phosphorylates CDC25B and that pre-phosphorylation of CDC25B by CDK1/CyclinB enhances its substrate properties for PLK1 in vitro

Publications:

1

Identifier	Residue	Organism	Cell Line
SIGNOR-264798		Chlorocebus aethiops	COS Cell
pmid	sentence
23455152	Here, we show that the p27/p25 heterodimer undergoes mitotic phosphorylation by cyclin‐dependent kinase 1 (Cdk1) at a single site, p27 Thr186, to generate an anchoring site for polo‐like kinase 1 (Plk1) at kinetochores.

Publications:

1

Organism:

Chlorocebus Aethiops

Identifier	Residue	Organism
SIGNOR-280072		Homo sapiens
pmid	sentence
36520312	The Hsp90 client Plk1 phosphorylates Sgt1, which had a positive impact on Sgt1 function, whereas phosphorylation of Tsc1 by Plk1 led to its ubiquitination and degradation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-280071		Homo sapiens
pmid	sentence
29250521	How this destabilizes the interaction of Nek2 with PP1 remains unclear, although one possibility is that Plk1 phosphorylation activates Mst2; this in turn would cause increased phosphorylation of Nek2, potentially decreasing its affinity for PP1.\|Meanwhile, phosphorylation of Mst2 by Plk1 prevents association of PP1 with Nek2 leading to increased phosphorylation of Nek2 substrates, such as C-Nap1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-147061		Homo sapiens	HeLa Cell
pmid	sentence
16760428	The plk1-bub1 interaction requires the polo-box domain (pbd) of plk1 and is enhanced by cyclin-dependent kinase 1 (cdk1)-mediated phosphorylation of bub1 at t609

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-280070		Homo sapiens
pmid	sentence
27330107	Subsequently, Plk1 phosphorylation of PTEN was shown to be responsible for its inactivation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-280068		Homo sapiens
pmid	sentence
24528857	In human cells, EME1 is phosphorylated by both cyclin-dependent kinases (CDKs) and PLK1, and this modification is directly correlated with increased MUS81 cleavage activity in\u00a0vitro.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-152136		Homo sapiens
pmid	sentence
17218258	Human pich was identified as an interaction partner and substrate of plk1. Our data indicate that plk1 prevents the association of pich with chromosome arms and restricts its localization to the kt/centromere region

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-275420		Homo sapiens	HeLa Cell
pmid	sentence
24413556	Phosphorylation by Cyclin B-Cdk1 allows Haspin to bind Plk1-PBD. Phosphorylation of Haspin at T128 and Plk1 target sites is required for full H3T3ph generation and normal Aurora B localization in mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-195028		Homo sapiens
pmid	sentence
Other

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-271464		Homo sapiens
pmid	sentence
17442268	Chfr, a mitotic stress checkpoint, plays an important role in cell cycle progression, tumor suppression and the processes that require the E3 ubiquitin ligase activity mediated by the RING finger domain. Chfr stimulates the formation of polyubiquitin chains by ub-conjugating enzymes, and induces the proteasome-dependent degradation of a number of cellular proteins including Plk1 and Aurora A.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-273614		Homo sapiens	HeLa Cell
pmid	sentence
19386263	Phosphorylation of hCenexin1 at S796 is critical for the hCenexin1-Plk1 interaction.Here we show that a splice variant of hODF2 called hCenexin1, but not hODF2 itself, efficiently localizes to somatic centrosomes via a variant-specific C-terminal extension and recruits Plk1 through a Cdc2-dependent phospho-S796 motif within the extension. This interaction and Plk1 activity were important for proper recruitment of pericentrin and gamma-tubulin, and, ultimately, for formation of normal bipolar spindles.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279562		Homo sapiens
pmid	sentence
25925375	DNA-PKcs Promotes Plk1 Activation.\|Further analysis revealed that DNA-PKcs could directly phosphorylate the C-terminal PBD domain of Plk1 (lane 8).

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-278423		Homo sapiens
pmid	sentence
25855382	In this study we linked these regulatory events mechanistically, by showing that Plk1 induces proteasomal degradation of SUZ12 and ZNF198 by site specific phosphorylation.\|Plk1 phosphorylates SUZ12 and ZNF198 in vitro.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279793		Homo sapiens
pmid	sentence
20042274	Indeed Chk2 mediates the degradation of Cdc25A to activate the S-phase checkpoint [5\u20137,18] , whereas ATM phosphorylates and inactivates Plk1, consolidating the delay in the entry into M phase [5\u201319] .\|Indeed Chk2 mediates the degradation of Cdc25A to activate the S-phase checkpoint [5-7,18], whereas ATM phosphorylates and inactivates Plk1, consolidating the delay in the entry into M phase [5-19].

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279553		Homo sapiens
pmid	sentence
17488623	Phosphorylation of Ect2 by Plk1 during anaphase might alleviate this intramolecular inhibition by dissociating the Ect2 amino from the carboxyl terminus.\|Together with the presence of a prominent microtubule array at the midzone, these data suggest that Plk1 is not essential for the formation of the central spindle at anaphase.The specific failure of Ect2 to localize to the midzone raised the interesting possibility that Plk1 might trigger the initiation of cytokinesis by promoting the interaction of Ect2 with centralspindlin and, thereby, Ect2 activation and recruitment to the central spindle.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279253		Homo sapiens
pmid	sentence
30202980	PLK1 targets CtIP to promote microhomology mediated end joining.\|We further showed that the DSB repair factor CtIP is jointly phosphorylated by CDK1 and Aurora A and PLK1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279096		Homo sapiens
pmid	sentence
31597699	As shown in Fig. S4D, the C-terminal NOTCH1 fragment was readily phosphorylated by PLK1.\|These results demonstrate that NOTCH1 protects cells from DNA damage\u2013induced arrest and that PLK1-mediated degradation of NOTCH1 may be essential for recovery from a DNA damage-induced arrest.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-190281		Homo sapiens
pmid	sentence
Other

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279551		Homo sapiens
pmid	sentence
23291182	However, unlike NEK2, PLK1 phosphorylation enhances the microtubule stabilizing activity of centrobin [22].\|PLK1 phosphorylation of centrobin is critical for bipolar spindle formation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-207200		Homo sapiens
pmid	sentence
Other

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-278491		Homo sapiens
pmid	sentence
25855382	Based on the mechanism of Plk1 mediated degradation of SUZ12 and ZNF198 described in this study (XREF_FIG), we quantified expression levels of Plk1 and HOTAIR RNAs in liver tumors from X/c-myc bitransgenic mice.\|We interpret these results to mean that HOTAIR facilitates ubiquitination of Plk1 phosphorylated SUZ12 and ZNF198 proteins, thereby accelerating their proteasomal degradation.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279094		Homo sapiens
pmid	sentence
26004507	In contrast to the non autonomous polarity defects caused by transgenic expression of Celsr1 LLtoAA, Plk1 inhibition did not cause a significant alteration in Celsr1 interphase polarity (XREF_FIG).\|Plk1 phosphorylates the Celsr1 cytoplasmic domain in\nvitro .

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279751		Homo sapiens
pmid	sentence
21813642	Here, we demonstrated in vitro and in vivo phosphorylation of RanBP1 by Plk1 as well as the importance of phosphorylation of RanBP1 in the interaction between Plk1 and Ran during early mitosis.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-258078		in vitro
pmid	sentence
22037378	Our data set represents the most detailed comprehensive assessment of the reactivity of known and clinical kinase inhibitors across the kinome published to date. \| The data also show that for at least 15 of the 27 kinases that are the primary, intended targets for the compounds tested and that are represented in the assay panel, selective inhibitors, as assessed by both absolute selectivity across the kinome and selectivity relative to the primary target, are among the 72 tested here.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Organism
SIGNOR-279423		Homo sapiens
pmid	sentence
33288550	Phosphorylation of the astrin N-terminal domain by Plk1 contributes to kinetochore\u2013microtubule attachment stability.\|Taken together with the localisation data in XREF_FIG B, these data suggest that the presence of the Plk1 phosphorylated astrin N-terminus promotes the accumulation of the astrin complex at attached kinetochores, without which attachments appear more prone to dissociate.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279345		Homo sapiens
pmid	sentence
30456393	Phosphorylation of NuMA by Plk1 at 1833/34 residue can impact its cortical localization.\|These data strongly suggest that Plk1 negatively regulate cortical NuMA localization and that this impact of Plk1 on NuMA is presumably independent of LGN, at least in the anaphase cells.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-259702		in vitro
pmid	sentence
22037378	Our data set represents the most detailed comprehensive assessment of the reactivity of known and clinical kinase inhibitors across the kinome published to date. \| The data also show that for at least 15 of the 27 kinases that are the primary, intended targets for the compounds tested and that are represented in the assay panel, selective inhibitors, as assessed by both absolute selectivity across the kinome and selectivity relative to the primary target, are among the 72 tested here.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Organism
SIGNOR-278532		Homo sapiens
pmid	sentence
27390342	As indicated in xref , all three Plk1 fragments were ubiquitinated by CHIP, suggesting that CHIP targets multiple sites of Plk1 for ubiquitination.\|Mechanistically, CHIP mediated degradation of AR and Plk1 leads to enhanced efficacy of HSP90 inhibitors.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-190290		Homo sapiens
pmid	sentence
Other

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-243522		Homo sapiens	HEK-293 Cell, Colorectal Adenocarcinoma Cell Line
pmid	sentence
23887393	Here, we report that PDK1 directly induces phosphorylation of Polo-like kinase 1 (PLK1), which in turn induces MYC phosphorylation and protein accumulation. We show that PDK1-PLK1-MYC signaling is critical for cancer cell growth and survival, and small-molecule inhibition of PDK1/PLK1 provides an effective approach for therapeutic targeting of MYC dependency

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279251		Homo sapiens
pmid	sentence
25540073	Note that PLK1 phosphorylates and activates BUB1 to localize it to the kinetochore, phosphorylates and inhibits the negative regulator PKMYTI and interacts with the G1/S kinase Cdc7p to target it to initiation complexes late in G1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279346		Homo sapiens
pmid	sentence
28102733	Of note, MYC-PLK1 (WT) overexpression strongly enhanced MTOR and RPTOR signals in PLK1 IPs, whereas the LAMP2 signal was strongly decreased (XREF_FIG).\|Thus, we conclude that PLK1 can directly phosphorylate RPTOR in vitro.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-265036		Homo sapiens	HeLa Cell
pmid	sentence
30021153	Here, we report that the activation of Plk1 requires WAC, a WW domain-containing adaptor protein with a coiled-coil region that predominantly localizes to the nucleus in interphase. Cyclin-dependent kinase 1 (Cdk1) phosphorylates WAC, priming its direct interaction with the polo-box domain of Plk1.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-278367		Homo sapiens
pmid	sentence
30611117	In summary, our results identify Cep85 as a platform to directly relay the activities of Plk1 and Mst2 to Nek2A activation at centrosomes through phospho-Nek2A-assistant Cep85 phosphorylation by Plk1 at the onset of mitosis.\|Plk1 Heavily Phosphorylates the Nek2A-Binding Domain in Cep85 at Centrosomes in Late G2.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Sequence	Organism	Cell Line
SIGNOR-271690
pmid	sentence
22108192	Stat3 directly activated transcription of PLK1 in esophageal cancer cells and mouse embryonic fibroblast cell NIH3T3.

Publications:

1

Identifier	Residue	Organism
SIGNOR-279554		Homo sapiens
pmid	sentence
20214750	As GRASP65 is a substrate of cdc2 and polo-like kinase, manipulation of GRASP65 level may affect the localization and activity of these kinases in cell cycle progression, as suggested by a previous study ( ).\|During mitosis, GRASP65 is phosphorylated by two mitotic kinases, cdc2 and polo-like kinase (plk), which leads to GRASP65 deoligomerization and thus Golgi unstacking ( xref , xref ).

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-258221		in vitro
pmid	sentence
22037378	Our data set represents the most detailed comprehensive assessment of the reactivity of known and clinical kinase inhibitors across the kinome published to date. \| The data also show that for at least 15 of the 27 kinases that are the primary, intended targets for the compounds tested and that are represented in the assay panel, selective inhibitors, as assessed by both absolute selectivity across the kinome and selectivity relative to the primary target, are among the 72 tested here.

Publications:

1

Organism:

In Vitro

Identifier	Residue	Organism
SIGNOR-280069		Homo sapiens
pmid	sentence
28817632	Moreover, phosphorylation of KIF4 and condensin I by Aurora B and polo like kinase 1 (Plk1) is important for KIF4 and condensin I localization to the chromosome.\|These results suggest that Plk1 negatively regulates the loading of both KIF4 and condensin to the chromosome.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-179425		Homo sapiens
pmid	sentence
18615013	Bora/aurora-a-dependent phosphorylation is a prerequisite for plk1 to promote mitotic entry after a checkpoint-dependent arrest.

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism	Cell Line
SIGNOR-243519		Homo sapiens	HEK-293 Cell, Colorectal Adenocarcinoma Cell Line
pmid	sentence
23887393	Here, we report that PDK1 directly induces phosphorylation of Polo-like kinase 1 (PLK1), which in turn induces MYC phosphorylation and protein accumulation. We show that PDK1-PLK1-MYC signaling is critical for cancer cell growth and survival, and small-molecule inhibition of PDK1/PLK1 provides an effective approach for therapeutic targeting of MYC dependency

Publications:

1

Organism:

Homo Sapiens

Identifier	Residue	Organism
SIGNOR-279095		Homo sapiens
pmid	sentence
26280018	Furthermore, PLK1 can directly phosphorylate FOXO3 in an in vitro kinase assay.\|PLK1 induces translocation of FOXO3 from the nucleus to the cytoplasm and suppresses FOXO3 activity, measured by the decrease in the pro-apoptotic Bim protein levels and in the cell cycle inhibitor protein p27.

Publications:

1

Organism:

Homo Sapiens

Name	PLK1 View Modifications
Full Name	Serine/threonine-protein kinase PLK1
Synonyms	Polo-like kinase 1, PLK-1, Serine/threonine-protein kinase 13, STPK13 \| PLK
Primary ID	P53350
Links	- -
Type	protein
Relations	292
Inhibitors	5-[6-[(4-methyl-1-piperazinyl)methyl]-1-benzimidazolyl]-3-[(1R)-1-[2-(trifluoromethyl)phenyl]ethoxy]-2-thiophenecarboxamide; N-(4-methoxyphenyl)sulfonyl-N-[2-[2-(1-oxido-4-pyridin-1-iumyl)ethenyl]phenyl]acetamide; Rigosertib sodium; 4-{[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-5,6,7,8-tetrahydropteridin-2-yl]amino}-3-methoxy-N-(1-methylpiperidin-4-yl)benzamide; TAK-960; BI 2536; Volasertib
Function	Serine/threonine-protein kinase that performs several important functions throughout M phase of the cell cycle, including the regulation of centrosome maturation and spindle assembly, the removal of cohesins from chromosome arms, the inactivation of anaphase-promoting complex/cyclosome (APC/C) inhibitors, and the regulation of mitotic exit and cytokinesis. Polo-like kinase proteins acts by binding and phosphorylating proteins are that already phosphorylated on a specific motif recognized by the POLO box domains. Phosphorylates BORA, BUB1B/BUBR1, CCNB1, CDC25C, CEP55, ECT2, ERCC6L, FBXO5/EMI1, FOXM1, KIF20A/MKLP2, CENPU, NEDD1, NINL, NPM1, NUDC, PKMYT1/MYT1, KIZ, PPP1R12A/MYPT1, PRC1, RACGAP1/CYK4, SGO1, STAG2/SA2, TEX14, TOPORS, p73/TP73, TPT1, WEE1 and HNRNPU. Plays a key role in centrosome functions and the assembly of bipolar spindles by phosphorylating KIZ, NEDD1 and NINL. NEDD1 phosphorylation promotes subsequent targeting of the gamma-tubulin ring complex (gTuRC) to the centrosome, an important step for spindle formation. Phosphorylation of NINL component of the centrosome leads to NINL dissociation from other centrosomal proteins. Involved in mitosis exit and cytokinesis by phosphorylating CEP55, ECT2, KIF20A/MKLP2, CENPU, PRC1 and RACGAP1. Recruited at the central spindle by phosphorylating and docking PRC1 and KIF20A/MKLP2; creates its own docking sites on PRC1 and KIF20A/MKLP2 by mediating phosphorylation of sites subsequently recognized by the POLO box domains. Phosphorylates RACGAP1, thereby creating a docking site for the Rho GTP exchange factor ECT2 that is essential for the cleavage furrow formation. Promotes the central spindle recruitment of ECT2. Plays a central role in G2/M transition of mitotic cell cycle by phosphorylating CCNB1, CDC25C, FOXM1, CENPU, PKMYT1/MYT1, PPP1R12A/MYPT1 and WEE1. Part of a regulatory circuit that promotes the activation of CDK1 by phosphorylating the positive regulator CDC25C and inhibiting the negative regulators WEE1 and PKMYT1/MYT1. Also acts by mediating phosphorylation of cyclin-B1 (CCNB1) on centrosomes in prophase. Phosphorylates FOXM1, a key mitotic transcription regulator, leading to enhance FOXM1 transcriptional activity. Involved in kinetochore functions and sister chromatid cohesion by phosphorylating BUB1B/BUBR1, FBXO5/EMI1 and STAG2/SA2. PLK1 is high on non-attached kinetochores suggesting a role of PLK1 in kinetochore attachment or in spindle assembly checkpoint (SAC) regulation. Required for kinetochore localization of BUB1B. Regulates the dissociation of cohesin from chromosomes by phosphorylating cohesin subunits such as STAG2/SA2. Phosphorylates SGO1

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