Membrane remodeling induced by the dynamin-related protein Drp1 stimulates Bax oligomerization.

Membrane remodeling induced by the dynamin-related protein Drp1 stimulates Bax oligomerization.
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DOI:
10.1016/j.cell.2010.08.017
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发表时间:
2010-09-17
期刊:
影响因子:
64.5
通讯作者:
Martinou JC
Martinou JC
中科院分区:
生物学1区
文献类型:
--
作者:
Montessuit S;Somasekharan SP;Terrones O;Lucken-Ardjomande S;Herzig S;Schwarzenbacher R;Manstein DJ;Bossy-Wetzel E;Basañez G;Meda P;Martinou JC

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为了响应许多细胞凋亡刺激,Bax 寡聚化对于线粒体外膜透化和随后的细胞色素 c 释放至关重要。这些事件伴随着线粒体裂变,线粒体裂变似乎需要 Drp1(动力超家族的一种大型 GTP 酶)。 Drp1 缺失会导致细胞色素 c 释放减少,其机制目前尚不清楚。在这里,我们证明 Drp1 通过促进体外膜的束缚和半融合来刺激 tBid 诱导的 Bax 寡聚化和细胞色素 c 释放。 Drp1 的这一功能独立于其 GTP 酶活性,并依赖于精氨酸 247 和膜中心磷脂的存在。在细胞中,Drp1 R247A/E 的过度表达会延迟 Bax 寡聚化和细胞死亡。我们的研究结果揭示了 Drp1 的新功能,并为 Bax 寡聚化机制提供了新的见解。
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 reveal a novel function of Drp1 and provide a new insight into the mechanism of Bax oligomerization.
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