© The Rockefeller University Press,
0021-9525/1997//327 $5.00
The Journal of Cell Biology, Volume 139, Number 2,
, 1997 327-338
p28 Bap31, a Bcl-2/Bcl-XL- and Procaspase-8–associated Protein in the Endoplasmic Reticulum
Florence W.H. Ng*,
Mai Nguyen*,
Tony Kwan*,
Philip E. Branton*,
Donald W. Nicholson
,
James A. Cromlish*, and
Gordon C. Shore*
* Department of Biochemistry, McIntyre Medical Sciences Building, McGill University, Montreal, Quebec, Canada H3G 1Y6; and
Merck-Frosst Center for Therapeutic Research, Pointe Claire–Dorval, Quebec, Canada H9R 4P8
We have identified a human Bcl-2–interacting protein, p28 Bap31. It is a 28-kD (p28) polytopic integral protein of the endoplasmic reticulum whose COOH-terminal cytosolic region contains overlapping predicted leucine zipper and weak death effector homology domains, flanked on either side by identical caspase recognition sites. In cotransfected 293T cells, p28 is part of a complex that includes Bcl-2/Bcl-XL and procaspase-8 (pro-FLICE). Bax, a pro-apoptotic member of the Bcl-2 family, does not associate with the complex; however, it prevents Bcl-2 from doing so. In the absence (but not presence) of elevated Bcl-2 levels, apoptotic signaling by adenovirus E1A oncoproteins promote cleavage of p28 at the two caspase recognition sites. Purified caspase-8 (FLICE/MACH/Mch5) and caspase-1(ICE), but not caspase-3 (CPP32/apopain/ Yama), efficiently catalyze this reaction in vitro. The resulting NH2-terminal p20 fragment induces apoptosis when expressed ectopically in otherwise normal cells. Taken together, the results suggest that p28 Bap31 is part of a complex in the endoplasmic reticulum that mechanically bridges an apoptosis-initiating caspase, like procaspase-8, with the anti-apoptotic regulator Bcl-2 or Bcl-XL. This raises the possibility that the p28 complex contributes to the regulation of procaspase-8 or a related caspase in response to E1A, dependent on the status of the Bcl-2 setpoint within the complex.
Abbreviations used in this paper: GST, glutathione S-transferase; HMK, heart muscle kinase; TM, transmembrane.
Address all correspondence to Gordon C. Shore, Department of Biochemistry, McIntyre Medical Sciences Building, McGill University, Montreal, QC, Canada H3G 1Y6. Tel.: (514) 398-7282; Fax: (514) 398-7384; E-mail: shore{at}medcor.mcgill.ca
The present address for James A. Cromlish is Institut de Recherches Cliniques de Montréal, Montréal, QC, Canada H2W 1R7.
This work was financed by operating grants from the National Cancer Institute of Canada and the Medical Research Council.

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