NF-kB (nuclear factor kB) is sequestered in the cytoplasm by IkB family of inhibitory proteins that mask the nuclear localization signal of NF-kB thereby preventing translocation of NF-kB to the nucleus. External stimuli such as tumor necrosis factor or other cytokines results in phosphorylation and degradation of IkB releasing NF-kB dimers. NF-kB dimer subsequently translocates to the nucleus and activates target genes. Synthesis of IkBa is autoregulated. IkB proteins are phosphorylated by IkB kinase complex consisting of at least three proteins, IKK1/a, IKK2/b, and IKK3/g. In vitro, IKK1/a and IKK2/b can form homo- and heterodimers that can phosphorylate IkBs at the regulatory serine residues directly. IKK1/a and IKK2/b are phosphorylated by NF-kB-inducing kinase (NIK) and MAP kinase kinase kinase-1 (MEKK1), respectively. Targeted disruption of IKK1/a gene in mice results in skin and limb abnormalities and death of newborns.
Synonyms
IKBKA; IKK-alpha; IKK1; IKKA; NFKBIKA; TCF16
Note
Use in Flow Intracellular reported in scientific literature (PMID 24804954)
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