BID is a death agonist that heterodimerizes with either agonist BAX or antagonist BCL2. Bid is a member of the BCL-2 family of cell death regulators. BID is a mediator of mitochondrial damage induced by caspase-8 (CASP8); CASP8 cleaves this encoded protein, and the COOH-terminal part translocates to mitochondria where it triggers cytochrome c release. BID is also a pro-apoptotic member of the Bcl 2 family. BID usually exists in an inactive form in the cytosolic fraction of living cells and becomes cleaved and activated by caspase 8 in response to TNF alpha or Fas ligand. Once BID is cleaved, the C-terminal 15 kDa fragment of BID (p15) translocates onto mitochondria and is sufficient to trigger cytochrome c release, resulting in cell apoptosis. BID serves as a direct molecular link between caspase 8 activation and mitochondrial death machinery.
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Protein Aliases: apoptic death agonist; BH3-interacting domain death agonist; BID; BID isoform ES(1b); BID isoform L(2); BID isoform Si6; desmocollin type 4; Human BID coding sequence; p22 BID
Gene Aliases: FP497
Entrez Gene ID: (Human) 637