FEATURES

FAMILY

DESCRIPTION

Also known as BIRC3_HUMAN, BIRC3, API2, MIHC, RNF49. Multi-functional protein which regulates not only caspases and apoptosis, but also modulates inflammatory signaling and immunity, mitogenic kinase signaling and cell proliferation, as well as cell invasion and metastasis. Acts as an E3 ubiquitin-protein ligase regulating NF-kappa-B signaling and regulates both canonical and non-canonical NF-kappa-B signaling by acting in opposite directions: acts as a positive regulator of the canonical pathway and suppresses constitutive activation of non-canonical NF-kappa-B signaling. The target proteins for its E3 ubiquitin-protein ligase activity include: RIPK1, RIPK2, RIPK3, RIPK4, CASP3, CASP7, CASP8, IKBKE, TRAF1, and BCL10. Acts as an important regulator of innate immune signaling via regulation of Toll-like receptors (TLRs), Nodlike receptors (NLRs) and RIG-I like receptors (RLRs), collectively referred to as pattern recognition receptors (PRRs). Protects cells from spontaneous formation of the ripoptosome, a large multi-protein complex that has the capability to kill cancer cells in a caspase-dependent and caspase-independent manner. Suppresses ripoptosome formation by ubiquitinating RIPK1 and CASP8. Interacts with DIABLO/SMAC and with PRSS25; these interactions inhibit apoptotic suppressor activity. The BIR motifs region interacts with TNF receptor associated factors 1 and 2 (TRAF1 and TRAF2) to form a heteromeric complex, which is then recruited to the tumor necrosis factor receptor 2 (TNFR2). Interaction with TRAF2 is required for ubiquitination of IKBKE, degradation of NFKBIA and activation of NF-kappa-B. Interacts with RIP1, RIP2, RIP3, RIP4 and USP19.

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EXTERNAL LINKS

BIRC3

Baculoviral IAP repeat-containing protein 3

ligandability Mutations

BIRC3

Molecular Synopsis