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Caspase cleaved BID targets mitochondria and is required for cytochrome c release, while BCL-XL prevents this release but not tumor necrosis factor-R1/Fas death
- Source :
- The Journal of biological chemistry. 274(2)
- Publication Year :
- 1999
-
Abstract
- "BH3 domain only" members of the BCL-2 family including the pro-apoptotic molecule BID represent candidates to connect with proximal signal transduction. Tumor necrosis factor alpha (TNFalpha) treatment induced a caspase-mediated cleavage of cytosolic, inactive p22 BID at internal Asp sites to yield a major p15 and minor p13 and p11 fragments. p15 BID translocates to mitochondria as an integral membrane protein. p15 BID within cytosol targeted normal mitochondria and released cytochrome c. Immunodepletion of p15 BID prevents cytochrome c release. In vivo, anti-Fas Ab results in the appearance of p15 BID in the cytosol of hepatocytes which translocates to mitochondria where it releases cytochrome c. Addition of activated caspase-8 to normal cytosol generates p15 BID which is also required in this system for release of cytochrome c. In the presence of BCL-XL/BCL-2, TNFalpha still induced BID cleavage and p15 BID became an integral mitochondrial membrane protein. However, BCL-XL/BCL-2 prevented the release of cytochrome c, yet other aspects of mitochondrial dysfunction still transpired and cells died nonetheless. Thus, while BID appears to be required for the release of cytochrome c in the TNF death pathway, the release of cytochrome c may not be required for cell death.
- Subjects :
- Cytochrome
Truncated BID
Molecular Sequence Data
bcl-X Protein
Bcl-xL
Apoptosis
Cytochrome c Group
Mitochondrion
urologic and male genital diseases
Biochemistry
Receptors, Tumor Necrosis Factor
Cytosol
Antigens, CD
Amino Acid Sequence
fas Receptor
Cycloheximide
Molecular Biology
biology
Tumor Necrosis Factor-alpha
Cytochrome c
Hydrolysis
Cell Biology
Fas receptor
Cell biology
Mitochondria
Proto-Oncogene Proteins c-bcl-2
Receptors, Tumor Necrosis Factor, Type I
Caspases
biology.protein
biological phenomena, cell phenomena, and immunity
Carrier Proteins
BH3 Interacting Domain Death Agonist Protein
Subjects
Details
- ISSN :
- 00219258
- Volume :
- 274
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- The Journal of biological chemistry
- Accession number :
- edsair.doi.dedup.....3845ee6d309bd08026cfd88faed6300d