NF-kB1 (DD)

Full Name:
Nuclear factor NF-kappa-B p105 subunit
Alternative Names:
p50, KBF1, p105, EBP-1, MGC54151, NFKB-p50, NF-kappaB, NFKB-p105, NF-kappa-B, DKFZp686C01211, NFKB1
Function:
NF-kappa-B is a pleiotropic transcription factor which is present in almost all cell types and is involved in many biological processed 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.
Death Domain Subfamily & Boundary Region:
  • DD : 805-892 Seq
Species External DB Questionmark
Uniprot DIP STRING KEGG IntAct MINT
Human Seq P19838external db link DIP-106Nexternal db link P19838external db link hsa:4790external db link P19838external db link MINT-85658external db link
Mouse Seq P25799external db link DIP-85Nexternal db link P25799external db link P25799external db link MINT-236136external db link
Rat Seq Q63369external db link Q63369external db link MINT-2739834external db link
Dog Seq Q6F3J0external db link Q6F3J0external db link cfa:442859external db link
Zebra fish Seq Q4PLU8external db link
Structure Species Residue Method Expression Purification Column Final condition Final concentration Reference
2DBF Download Human NMR
No information
Arrow2 In vitro interaction Arrow2 In vivo interaction Arrow2 Characterization Arrow2 Functional role Arrow2 top
In vitro interaction
  DD1 DD2 Reference
Family DD1 DD2 Method Species Region Expression Species Region Expression
DD NF-kB1 Link NF-kB2 Affinity purification-mass spectrometry HEK293 lysate HEK293 lysate 14743216
(Link: click this icon to show interactions only between the two corresponding DDs)
Arrow2 In vitro interaction Arrow2 In vivo interaction Arrow2 Characterization Arrow2 Functional role Arrow2 top
In vivo interaction
  Endogenous
expression
Overexpression DD1 DD2 Reference
Family DD1 DD2 Method Species Region Species Region
DD NF-kB1 Link NF-kB2 Co-immunoprecipitation U2OS 17962807
(Link: click this icon to show interactions only between the two corresponding DDs)