Domain:Intact BH3 motif is required by BIK , BID , BAK , BAD and BAX for their pro-apoptotic activity and for their interaction with anti-apoptotic members of the Bcl-2 family. ,Function:The major proteolytic product p15 BID allows the release of cytochrome c (By similarity) . Isoform 1 , isoform 2 and isoform 4 induce ICE-like proteases and apoptosis. Isoform 3 does not induce apoptosis. Counters the protective effect of Bcl-2. ,PTM:Phosphorylated upon DNA damage , probably by ATM or ATR. ,PTM:TNF-alpha induces a caspase-mediated cleavage of p22 BID into a major p15 and minor p13 and p11 products. ,subcellular location:A significant proportion of isoform 2 localizes to mitochondria , it may be cleaved constitutively. ,subcellular location:Associated with the mitochondrial membrane. ,subcellular location:Translocates to mitochondria as an integral membrane protein. ,subcellular location:When uncleaved , it is predominantly cytoplasmic. ,subunit:Forms heterodimers either with the pro-apoptotic protein BAX or the anti-apoptotic protein Bcl-2. ,tissue specificity:Isoforms 2 and 3 are expressed in spleen , bone marrow , cerebral and cerebellar cortex. Isoform 2 is expressed in spleen , pancreas and placenta (at protein level) . Isoform 3 is expressed in lung , pancreas and spleen (at protein level) . Isoform 4 is expressed in lung and pancreas (at protein level) . ,
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