Summary

Name NFKB1
Full Name Nuclear factor NF-kappa-B p105 subunit
Synonyms DNA-binding factor KBF1, EBP-1, Nuclear factor of kappa light polypeptide gene enhancer in B-cells 1
Primary ID P19838
Links - -
Type protein
Relations 48
Pathways Glucocorticoid receptor Signaling, NOTCH Signaling
Function NF-kappa-B is a pleiotropic transcription factor present in almost all cell types and is the endpoint of a series of signal transduction events that are initiated by a vast array of stimuli related to many biological processes such as inflammation, immunity, differentiation, cell growth, tumorigenesis and apoptosis. NF-kappa-B is a homo- or heterodimeric complex formed by the Rel-like domain-containing proteins RELA/p65, RELB, NFKB1/p105, NFKB1/p50, REL and NFKB2/p52 and the heterodimeric p65-p50 complex appears to be most abundant one. The dimers bind at kappa-B sites in the DNA of their target genes and the individual dimers have distinct preferences for different kappa-B sites that they can bind with distinguishable affinity and specificity. Different dimer combinations act as transcriptional activators or repressors, respectively. NF-kappa-B is controlled by various mechanisms of post-translational modification and subcellular compartmentalization as well as by interactions with other cofactors or corepressors. NF-kappa-B complexes are held in the cytoplasm in an inactive state complexed with members of the NF-kappa-B inhibitor (I-kappa-B) family. In a conventional activation pathway, I-kappa-B is phosphorylated by I-kappa-B kinases (IKKs) in response to different activators, subsequently degraded thus liberating the active NF-kappa-B complex which translocates to the nucleus. NF-kappa-B heterodimeric p65-p50 and RelB-p50 complexes are transcriptional activators. The NF-kappa-B p50-p50 homodimer is a transcriptional repressor, but can act as a transcriptional activator when associated with BCL3. NFKB1 appears to have dual functions such as cytoplasmic retention of attached NF-kappa-B proteins by p105 and generation of p50 by a cotranslational processing. The proteasome-mediated process ensures the production of both p50 and p105 and preserves their independent function, although processing of NFKB1/p105 also appears to occur post-translationally. p50 binds to the kappa-B consensus sequence 5'-GGRNNYYCC-3', located in the enhancer region of genes involved in immune response and acute phase reactions. In a complex with MAP3K8, NFKB1/p105 represses MAP3K8-induced MAPK signaling; active MAP3K8 is released by proteasome-dependent degradation of NFKB1/p105.

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Modifications Tables

Relations

Regulator Mechanism target score
+ down-regulates img/direct_inhibition.png phosphorylation NFKB1 0.28
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png phosphorylation NFKB1 0.481
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by stabilization img/direct-activation.png phosphorylation NFKB1 0.397
Publications: 2 Organism: Mus Musculus
+ down-regulates activity img/direct_inhibition.png phosphorylation NFKB1 0.848
Publications: 3 Organism: Homo Sapiens
+ down-regulates quantity by destabilization img/direct_inhibition.png phosphorylation NFKB1 0.737
Publications: 7 Organism: Mus Musculus, Homo Sapiens
+ down-regulates quantity by destabilization img/direct_inhibition.png phosphorylation NFKB1 0.848
Publications: 3 Organism: Homo Sapiens
+ up-regulates quantity by stabilization img/direct-activation.png phosphorylation NFKB1 0.481
Publications: 1
+ down-regulates quantity img/direct_inhibition.png ubiquitination NFKB1 0.2
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by destabilization img/direct_inhibition.png polyubiquitination NFKB1 0.567
Publications: 1 Organism: In Vitro
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation NFKB1 0.504
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png binding NFKB1 0.564
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation BIRC3 0.652
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation CD80 0.306
Publications: 1 Organism: Mus Musculus
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation IEX-1L 0.2
Publications: 1 Organism: Homo Sapiens
+ down-regulates activity img/indirect_inhibition.png NFKB1 0.261
Publications: 1 Organism: Homo Sapiens
+ down-regulates img/direct_inhibition.png binding NFKB1 0.516
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation NFKB1 0.58
Publications: 1 Organism: Homo Sapiens
+ down-regulates activity img/direct_inhibition.png binding NFKB1 0.721
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation BIRC2 0.426
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/direct-activation.png binding NFKB1 0.249
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by repression img/direct_inhibition.png transcriptional regulation NFKB1 0.579
Publications: 1 Organism: Homo Sapiens
Pathways:Glucocorticoid receptor Signaling
+ down-regulates quantity by destabilization img/direct_inhibition.png polyubiquitination NFKB1 0.407
Publications: 1 Organism: Homo Sapiens
+ form complex img/form-complex.png binding NfKb-p65/p50 0.694
Publications: 1 Organism: Homo Sapiens
Pathways:Glucocorticoid receptor Signaling
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation NFKB1 0.385
Publications: 1 Organism: Homo Sapiens
Pathways:NOTCH Signaling
+ down-regulates quantity by repression img/indirect_inhibition.png transcriptional regulation THBD 0.2
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by repression img/indirect_inhibition.png transcriptional regulation NFKB1 0.361
Publications: 1 Organism: Mus Musculus
Tissue: Skeletal Muscle
+ up-regulates img/direct-activation.png ubiquitination NFKB1 0.422
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by repression img/indirect_inhibition.png transcriptional regulation NFKB1 0.2
Publications: 1 Organism: Homo Sapiens
+ up-regulates activity img/direct-activation.png binding RELA 0.694
Publications: 1 Organism: Homo Sapiens
+ up-regulates img/indirect-activation.png NFKB1 0.336
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by repression img/indirect_inhibition.png transcriptional regulation CTCF 0.311
Publications: 1 Organism: Homo Sapiens
+ img/unknown.png transcriptional regulation NPPB 0.2
Publications: 1
+ up-regulates activity img/direct-activation.png ubiquitination NFKB1 0.497
Publications: 1 Organism: Chlorocebus Aethiops
+ down-regulates img/direct_inhibition.png binding MAP3K8 0.672
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation TRAF1 0.541
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity by repression img/direct_inhibition.png transcriptional regulation BMP4 0.2
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/direct-activation.png transcriptional regulation KLK3 0.2
Publications: 1 Organism: Homo Sapiens