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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Cheng, E. H. Takahashi, A. Hardwick, J. M. Kirsch, D. G. Kastan, M. B. Griffin, D. E. Ueno, K. Karp, C. L. Earnshaw, W. C. Clem, R. J. Veliuona, M. A. |
| Description | Author Affiliation: Clem RJ ( Department of Molecular Microbiology and Immunology, Johns Hopkins University Schools of Public Health and Medicine, Baltimore, MD 21205, USA.); |
| Abstract | The caspases are cysteine proteases that have been implicated in the execution of programmed cell death in organisms ranging from nematodes to humans. Many members of the Bcl-2 family, including Bcl-XL, are potent inhibitors of programmed cell death and inhibit activation of caspases in cells. Here, we report a direct interaction between caspases and Bcl-XL. The loop domain of Bcl-XL is cleaved by caspases in vitro and in cells induced to undergo apoptotic death after Sindbis virus infection or interleukin 3 withdrawal. Mutation of the caspase cleavage site in Bcl-XL in conjunction with a mutation in the BH1 homology domain impairs the death-inhibitory activity of Bcl-XL, suggesting that interaction of Bcl-XL with caspases may be an important mechanism of inhibiting cell death. However, once Bcl-XL is cleaved, the C-terminal fragment of Bcl-XL potently induces apoptosis. Taken together, these findings indicate that the recognition/cleavage site of Bcl-XL may facilitate protection against cell death by acting at the level of caspase activation and that cleavage of Bcl-XL during the execution phase of cell death converts Bcl-XL from a protective to a lethal protein. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 2 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Apoptosis Cysteine Endopeptidases Physiology Proto-Oncogene Proteins C-bcl-2 Signal Transduction Cell Line Enzyme Activation Escherichia Coli Mutation Bcl-X Protein Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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