Summary

Name SYK
Full Name Tyrosine-protein kinase SYK
Synonyms Spleen tyrosine kinase, p72-Syk
Primary ID P43405
Links - -
Type protein
Relations 91
Pathways B-cell activation
Inhibitors 6-[[5-fluoro-2-(3,4,5-trimethoxyanilino)-4-pyrimidinyl]amino]-2,2-dimethyl-4H-pyrido[3,2-b][1,4]oxazin-3-one; R406; 2-[[7-(3,4-dimethoxyphenyl)-5-imidazo[1,2-c]pyrimidinyl]amino]-3-pyridinecarboxamide; Fostamatinib disodium
Function Non-receptor tyrosine kinase which mediates signal transduction downstream of a variety of transmembrane receptors including classical immunoreceptors like the B-cell receptor (BCR). Regulates several biological processes including innate and adaptive immunity, cell adhesion, osteoclast maturation, platelet activation and vascular development. Assembles into signaling complexes with activated receptors at the plasma membrane via interaction between its SH2 domains and the receptor tyrosine-phosphorylated ITAM domains. The association with the receptor can also be indirect and mediated by adapter proteins containing ITAM or partial hemITAM domains. The phosphorylation of the ITAM domains is generally mediated by SRC subfamily kinases upon engagement of the receptor. More rarely signal transduction via SYK could be ITAM-independent. Direct downstream effectors phosphorylated by SYK include VAV1, PLCG1, PI-3-kinase, LCP2 and BLNK. Initially identified as essential in B-cell receptor (BCR) signaling, it is necessary for the maturation of B-cells most probably at the pro-B to pre-B transition. Activated upon BCR engagement, it phosphorylates and activates BLNK an adapter linking the activated BCR to downstream signaling adapters and effectors. It also phosphorylates and activates PLCG1 and the PKC signaling pathway. It also phosphorylates BTK and regulates its activity in B-cell antigen receptor (BCR)-coupled signaling. In addition to its function downstream of BCR plays also a role in T-cell receptor signaling. Plays also a crucial role in the innate immune response to fungal, bacterial and viral pathogens. It is for instance activated by the membrane lectin CLEC7A. Upon stimulation by fungal proteins, CLEC7A together with SYK activates immune cells inducing the production of ROS. Also activates the inflammasome and NF-kappa-B-mediated transcription of chemokines and cytokines in presence of pathogens. Regulates neutrophil degranulation and phagocytosis through activation of the MAPK signaling cascade (By similarity). Required for the stimulation of neutrophil phagocytosis by IL15 (PubMed:15123770). Also mediates the activation of dendritic cells by cell necrosis stimuli. Also involved in mast cells activation. Involved in interleukin-3/IL3-mediated signaling pathway in basophils (By similarity). Also functions downstream of receptors mediating cell adhesion. Relays for instance, integrin-mediated neutrophils and macrophages activation and P-selectin receptor/SELPG-mediated recruitment of leukocytes to inflammatory loci. Plays also a role in non-immune processes. It is for instance involved in vascular development where it may regulate blood and lymphatic vascular separation. It is also required for osteoclast development and function. Functions in the activation of platelets by collagen, mediating PLCG2 phosphorylation and activation. May be coupled to the collagen receptor by the ITAM domain-containing FCER1G. Also activated by the membrane lectin CLEC1B that is required for activation of platelets by PDPN/podoplanin. Involved in platelet adhesion being activated by ITGB3 engaged by fibrinogen. Together with CEACAM20, enhances production of the cytokine CXCL8/IL-8 via the NFKB pathway and may thus have a role in the intestinal immune response (By similarity).

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Modifications Tables

Relations

Regulator Mechanism target score
+ down-regulates activity img/direct_inhibition.png phosphorylation CDC25C 0.361
Publications: 1 Organism: Homo Sapiens
+ down-regulates img/direct_inhibition.png phosphorylation SYK 0.31
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png phosphorylation IKZF1 0.405
Publications: 2 Organism: Homo Sapiens
+ down-regulates activity img/direct_inhibition.png phosphorylation PIP5K1B 0.2
Publications: 1 Organism: Chlorocebus Aethiops
+ up-regulates activity img/direct-activation.png phosphorylation GCSAM 0.357
Publications: 5 Organism: In Vitro
+ down-regulates img/direct_inhibition.png phosphorylation SNCA 0.533
Publications: 3 Organism: Homo Sapiens
Tissue: Ovary, Brain
+ up-regulates activity img/direct-activation.png phosphorylation SYK 0.2
Publications: 6 Organism: Homo Sapiens
Pathways:B-cell activation
+ up-regulates activity img/direct-activation.png phosphorylation LAT2 0.596
Publications: 3 Organism: Mus Musculus
+ up-regulates activity img/direct-activation.png phosphorylation DUSP3 0.361
Publications: 1 Organism: Chlorocebus Aethiops
+ up-regulates activity img/direct-activation.png phosphorylation SH3BP2 0.552
Publications: 3 Organism: Chlorocebus Aethiops
+ up-regulates img/direct-activation.png phosphorylation BLNK 0.808
Publications: 4 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates img/direct_inhibition.png phosphorylation MAPT 0.466
Publications: 1 Organism: Homo Sapiens
+ down-regulates activity img/direct_inhibition.png phosphorylation LCK 0.592
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation LAX1 0.377
Publications: 4 Organism: Homo Sapiens
+ img/unknown.png phosphorylation SLC4A1 0.45
Publications: 2 Organism: In Vitro
+ up-regulates img/direct-activation.png phosphorylation SLC4A1 0.45
Publications: 2 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation CGAS 0.2
Publications: 2 Organism: Mus Musculus
+ up-regulates activity img/direct-activation.png phosphorylation IL15RA 0.328
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation FCGR2A 0.674
Publications: 2 Organism: In Vitro
+ up-regulates activity img/direct-activation.png phosphorylation FCGR2C 0.2
Publications: 2 Organism: In Vitro
+ down-regulates activity img/direct_inhibition.png phosphorylation DEPTOR 0.2
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png phosphorylation SHC1 0.764
Publications: 3 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation SYK 0.254
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png phosphorylation HCLS1 0.668
Publications: 2 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation MAP4K1 0.346
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation TUBA4A 0.328
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation BTK 0.591
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ up-regulates activity img/direct-activation.png phosphorylation PRKCA 0.39
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates quantity img/direct_inhibition.png phosphorylation USP25 0.383
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation FLT3 0.406
Publications: 2 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation PLCG1 0.773
Publications: 2 Organism: Homo Sapiens
Pathways:B-cell activation
+ up-regulates activity img/direct-activation.png binding SYK 0.717
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ up-regulates activity img/direct-activation.png binding SYK 0.717
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates activity img/direct_inhibition.png dephosphorylation SYK 0.417
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates activity img/direct_inhibition.png chemical inhibition SYK 0.8
Publications: 1 Organism: In Vitro
+ up-regulates activity img/direct-activation.png binding SYK 0.352
Publications: 1 Organism: In Vitro
+ up-regulates activity img/direct-activation.png binding SYK 0.717
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ up-regulates activity img/direct-activation.png phosphorylation PLCG2 0.753
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates activity img/direct_inhibition.png ubiquitination SYK 0.816
Publications: 1 Organism: Homo Sapiens
+ down-regulates activity img/direct_inhibition.png dephosphorylation SYK 0.2
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates activity img/direct_inhibition.png dephosphorylation SYK 0.547
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation EZR 0.449
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation SYK 0.27
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png binding SYK 0.92
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity img/direct_inhibition.png ubiquitination SYK 0.816
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png phosphorylation VAV1 0.92
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation LRRFIP1 0.2
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation STAT3 0.551
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation SYK 0.611
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates img/direct_inhibition.png chemical inhibition SYK 0.8
Publications: 1 Organism: Homo Sapiens
+ down-regulates activity img/direct_inhibition.png phosphorylation PAX5 0.423
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation SYK 0.594
Publications: 1 Organism: Homo Sapiens
+ down-regulates img/direct_inhibition.png dephosphorylation SYK 0.738
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png binding SYK 0.717
Publications: 1 Organism: Homo Sapiens
Pathways:B-cell activation
+ down-regulates activity img/direct_inhibition.png chemical inhibition SYK 0.8
Publications: 1 Organism: Homo Sapiens
+ down-regulates img/direct_inhibition.png chemical inhibition SYK 0.8
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png phosphorylation HUWE1 0.2
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by destabilization img/direct_inhibition.png polyubiquitination SYK 0.291
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity img/direct_inhibition.png ubiquitination SYK 0.695
Publications: 1 Organism: Homo Sapiens