Journal
CELL
Volume 142, Issue 6, Pages 889-901Publisher
CELL PRESS
DOI: 10.1016/j.cell.2010.08.017
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Funding
- Swiss National Science Foundation [310000-109402]
- Juvenile Diabetes Foundation International [1-2007-158]
- European Union [222980]
- DFG [MA 1081/7-2]
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In response to many apoptotic stimuli, oligomerization of Bax is essential for mitochondrial outer membrane permeabilization and the ensuing release of cytochrome c. These events are accompanied by mitochondrial fission that appears to require Drp1, a large GTPase of the dynamin superfamily. Loss of Drp1 leads to decreased cytochrome c release by a mechanism that is poorly understood. Here we show that Drp1 stimulates tBid-induced Bax oligomerization and cytochrome c release by promoting tethering and hemifusion of membranes in vitro. This function of Drp1 is independent of its GTPase activity and relies on arginine 247 and the presence of cardiolipin in membranes. In cells, overexpression of Drp1 R247A/E delays Bax oligomerization and cell death. Our findings uncover a function of Drp1 and provide insight into the mechanism of Bax oligomerization.
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