Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
Abstract

How Bcl-2 and its pro-survival relatives prevent activation of the caspases that mediate apoptosis is unknown, but they appear to act through the caspase activator apoptosis protease–activating factor 1 (Apaf-1). According to the apoptosome model, the Bcl-2–like proteins preclude Apaf-1 activity by sequestering the protein. To explore Apaf-1 function and to test this model, we generated monoclonal antibodies to Apaf-1 and used them to determine its localization within diverse cells by subcellular fractionation and confocal laser scanning microscopy. Whereas Bcl-2 and Bcl-xL were prominent on organelle membranes, endogenous Apaf-1 was cytosolic and did not colocalize with them, even when these pro-survival proteins were overexpressed or after apoptosis was induced. Immunogold electron microscopy confirmed that Apaf-1 was dispersed in the cytoplasm and not on mitochondria or other organelles. After the death stimuli, Bcl-2 and Bcl-xL precluded the release of the Apaf-1 cofactor cytochrome c from mitochondria and the formation of larger Apaf-1 complexes, which are steps that presage apoptosis. However, neither Bcl-2 nor Bcl-xL could prevent the in vitro activation of Apaf-1 induced by the addition of exogenous cytochrome c. Hence, rather than sequestering Apaf-1 as proposed by the apoptosome model, Bcl-2–like proteins probably regulate Apaf-1 indirectly by controlling upstream events critical for its activation.

Bibliography

Hausmann, G., O’Reilly, L. A., van Driel, R., Beaumont, J. G., Strasser, A., Adams, J. M., & Huang, D. C. S. (2000). Pro-Apoptotic Apoptosis Protease–Activating Factor 1 (Apaf-1) Has a Cytoplasmic Localization Distinct from Bcl-2 or Bcl-XL. The Journal of Cell Biology, 149(3), 623–634.

Authors 7
  1. George Hausmann (first)
  2. Lorraine A. O'Reilly (additional)
  3. Rosemary van Driel (additional)
  4. Jennifer G. Beaumont (additional)
  5. Andreas Strasser (additional)
  6. Jerry M. Adams (additional)
  7. David C.S. Huang (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 12:45 p.m.)
Deposited 2 years, 1 month ago (July 28, 2023, 10:23 p.m.)
Indexed 3 months, 2 weeks ago (May 18, 2025, 12:22 p.m.)
Issued 25 years, 4 months ago (May 1, 2000)
Published 25 years, 4 months ago (May 1, 2000)
Published Online 25 years, 4 months ago (May 1, 2000)
Published Print 25 years, 4 months ago (May 1, 2000)
Funders 0

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@article{Hausmann_2000, title={Pro-Apoptotic Apoptosis Protease–Activating Factor 1 (Apaf-1) Has a Cytoplasmic Localization Distinct from Bcl-2 or Bcl-XL}, volume={149}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.149.3.623}, DOI={10.1083/jcb.149.3.623}, number={3}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Hausmann, George and O’Reilly, Lorraine A. and van Driel, Rosemary and Beaumont, Jennifer G. and Strasser, Andreas and Adams, Jerry M. and Huang, David C.S.}, year={2000}, month=may, pages={623–634} }