Mouse BID cleaved with caspase-8 generates the amino-terminal fragment (amino acids 1-59, 7 kDa) and the carboxy-terminal fragment (amino acids 60-195, 15 kDa). On size exclusion chromatography cleaved BID elutes at 27 kDa indicating that the fragments remain associated.
Biochem/physiol Actions
Caspase-8-cleaved BID relocates from the cytosol to the outer mitochondrial membrane where its interaction with Bak alters mitochondrial membrane permeability.
Physical form
0.2 μm filtered solution in 25 mM HEPES, pH 7.5, and 0.1 M KCl.
Analysis Note
Measured by its ability to induce cytochrome c release from isolated mouse liver mitochondria.
TNFR1/Fas engagement results in the cleavage of cytosolic BID to truncated tBID, which translocates to mitochondria. Immunodepletion and gene disruption indicate BID is required for cytochrome c release. Surprisingly, the three-dimensional structure of this BH3 domain-only molecule revealed two hydrophobic
We report here the purification of a cytosolic protein that induces cytochrome c release from mitochondria in response to caspase-8, the apical caspase activated by cell surface death receptors such as Fas and TNF. Peptide mass fingerprinting identified this protein
Science (New York, N.Y.), 290(5497), 1761-1765 (2000-12-02)
Many apoptotic molecules relocate subcellularly in cells undergoing apoptosis. The pro-apoptotic protein BID underwent posttranslational (rather than classic cotranslational) N-myristoylation when cleavage by caspase 8 caused exposure of a glycine residue. N-myristoylation enabled the targeting of a complex of p7
We report here that BID, a BH3 domain-containing proapoptotic Bcl2 family member, is a specific proximal substrate of Casp8 in the Fas apoptotic signaling pathway. While full-length BID is localized in cytosol, truncated BID (tBID) translocates to mitochondria and thus
BCL-2 family members and the mitochondria in apoptosis.
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