Phospho-IKK Complex phosphorylates NFkB inhibitor within the NFkB inhibitor:NFkB complex

Stable Identifier
Reaction [transition]
Homo sapiens
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In human, IkB is an inhibitory protein that sequesters NF-kB in the cytoplasm, by masking a nuclear localization signal, located just at the C-terminal end in each of the NF-kB subunits.

A key event in NF-kB activation involves phosphorylation of IkB by an IkB kinase (IKK). The phosphorylation and ubiquitination of IkB kinase complex is mediated by two distinct pathways, either the classical or alternative pathway. In the classical NF-kB signaling pathway, the activated IKK (IkB kinase) complex, predominantly acting through IKK beta in an IKK gamma-dependent manner, catalyzes the phosphorylation of IkBs (at sites equivalent to Ser32 and Ser36 of human IkB-alpha or Ser19 and Ser22 of human IkB-beta); Once phosphorylated, IkB undergoes ubiquitin-mediated degradation, releasing NF-kB.

Literature References
Participant Of
Catalyst Activity
Catalyst Activity
protein serine/threonine kinase activity of IKBKG:p-S176,S180-CHUK:p-S177,S181-IKBKB [cytosol]
Physical Entity
This event is regulated
Negatively by
Orthologous Events
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