The role of BH3-only protein Bim extends beyond inhibiting Bcl-2-like prosurvival proteins
Details
Publication Year 2009-08-10, Volume 186, Issue #3, Page 355-362
Journal Title
JOURNAL OF CELL BIOLOGY
Publication Type
Journal Article
Abstract
Proteins of the Bcl-2 family are critical regulators of apoptosis, but how its BH3-only members activate the essential effectors Bax and Bak remains controversial. The indirect activation model suggests that they simply must neutralize all of the prosurvival Bcl-2 family members, whereas the direct activation model proposes that Bim and Bid must activate Bax and Bak directly. As numerous in vitro studies have not resolved this issue, we have investigated Bim's activity in vivo by a genetic approach. Because the BH3 domain determines binding specificity for Bcl-2 relatives, we generated mice having the Bim BH3 domain replaced by that of Bad, Noxa, or Puma. The mutants bound the expected subsets of prosurvival relatives but lost interaction with Bax. Analysis of the mice showed that Bim's proapoptotic activity is not solely caused by its ability to engage its prosurvival relatives or solely to its binding to Bax. Thus, initiation of apoptosis in vivo appears to require features of both models.
Publisher
ROCKEFELLER UNIV PRESS
Keywords
MEMBRANE PERMEABILIZATION; FAMILY-MEMBERS; BAX ACTIVATION; BH3 DOMAINS; APOPTOSIS; PUMA; MECHANISM; BINDING; HELIX
Rights Notice
Refer to copyright notice on published article.


Creation Date: 2009-08-10 12:00:00
Last Modified: 0001-01-01 12:00:00
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