Inhibitor of nuclear factor kappa-B kinase subunit gamma (IKK-gamma) (NEMO)

Inhibitor of nuclear factor kappa-B kinase subunit gamma (IKK-gamma), also known as NF-kappa-B essential modulator (NEMO), is the non-catalytic regulatory subunit of the IκB kinase (IKK) complex [UniProt: P51948]. It plays a pivotal role in the canonical NF-κB signaling pathway by acting as a scaffold that assembles the catalytic subunits, IKK-alpha and IKK-beta, and linking them to upstream activators such as TNF receptors, Toll-like receptors, and T-cell receptors [PubMed: 11048709]. Upon stimulation, IKK-gamma undergoes polyubiquitination, which facilitates the activation of the catalytic subunits; these then phosphorylate IκB proteins, marking them for proteasomal degradation and allowing NF-κB transcription factors to enter the nucleus [PubMed: 24037306]. Mutations in the IKBKG gene encoding this protein are responsible for several X-linked genetic disorders, including incontinentia pigmenti and anhidrotic ectodermal dysplasia with immunodeficiency [NCBI: NBK1116]. In drug discovery, IKK-gamma is targeted to treat chronic inflammatory diseases and certain cancers where NF-κB is constitutively active. Therapeutic approaches often utilize NEMO-binding domain (NBD) peptides to disrupt the interaction between IKK-gamma and the catalytic subunits, thereby preventing complex formation and signaling [PubMed: 11048709]. However, because NF-κB is essential for normal immune function and cell survival, systemic inhibition of IKK-gamma carries significant risks of immunosuppression and toxicity [PubMed: 15034166].

Other names

NF-kappa-B essential modulatorNEMOIKKGFIP-3FIP3IKBKGInhibitor of nuclear factor kappa-B kinase subunit gamma

Disruption of the IKK complex assembly by preventing the interaction between the NEMO regulatory subunit and the catalytic IKK subunits [PubMed: 11048709].