cIAP-2/HIAP-1 Antibody – Rabbit Polyclonal

This gene encodes a member of the IAP family of proteins that inhibit apoptosis by binding to tumor necrosis factor receptor-associated factors TRAF1 and TRAF2, probably by interfering with activation of ICE-like proteases. The encoded protein inhibits apoptosis induced by serum deprivation but does not affect apoptosis resulting from exposure to menadione, a potent inducer of free radicals. It contains 3 baculovirus IAP repeats and a ring finger domain. Transcript variants encoding the same isoform have been identified. [provided by RefSeq, Aug 2011]

cIAP2: 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, 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 an heteromeric complex, which is then recruited to the tumor necrosis factor receptor 2 (TNFR2). Interacts with RIP1, RIP2, RIP3, RIP4 and USP19. Highly expressed in fetal lung, and kidney. In the adult, expression is mainly seen in lymphoid tissues, including spleen, thymus and peripheral blood lymphocytes. USP19 regulates the stability of BIRC3/c-IAP2 by preventing its ubiquitination. Belongs to the IAP family.

Protein type: Ligase; Ubiquitin ligase; Apoptosis; Ubiquitin conjugating system; EC 6.3.2.-

Chromosomal Location of Human Ortholog: 11q22

Cellular Component: nucleoplasm; spindle microtubule; cytoplasm; nucleus; cytosol; lipid raft

Molecular Function: protein binding; zinc ion binding; caspase inhibitor activity; ubiquitin-protein ligase activity; ligase activity

Biological Process: regulation of toll-like receptor signaling pathway; positive regulation of I-kappaB kinase/NF-kappaB cascade; protein heterooligomerization; MyD88-independent toll-like receptor signaling pathway; protein ubiquitination; toll-like receptor 3 signaling pathway; regulation of innate immune response; regulation of apoptosis; cell surface receptor linked signal transduction; positive regulation of protein ubiquitination; regulation of inflammatory response; toll-like receptor signaling pathway; negative regulation of phosphorylation; innate immune response; spermatogenesis; toll-like receptor 4 signaling pathway; negative regulation of apoptosis