Effects of Cardiolipin on the Conformational Dynamics of Membrane-Anchored Bcl-xL.

Effects of Cardiolipin on the Conformational Dynamics of Membrane-Anchored Bcl-xL.
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DOI:
10.3390/ijms22179388
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发表时间:
2021-08-30
影响因子:
5.6
通讯作者:
Ladokhin AS
Ladokhin AS
中科院分区:
生物学2区
文献类型:
--
作者:
Tyagi V;Vasquez-Montes V;Freites JA;Kyrychenko A;Tobias DJ;Ladokhin AS

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抗凋亡蛋白Bcl-xL通过阻止促凋亡成孔蛋白渗透线粒体外膜来调节凋亡,促凋亡成孔蛋白将凋亡因子释放到细胞溶质中,最终导致细胞死亡。两种不同的膜整合Bcl-xL结构已被确定:膜锚定和膜插入的构象。在这里,我们使用分子动力学模拟来研究线粒体特异性脂质心磷脂和蛋白质质子化状态对膜锚定的Bcl-xL的构象动力学的影响。分析表明,蛋白质的质子化状态和膜的心磷脂含量调节可溶性头部区域(螺旋α1至α7)的方向,从而调节其BH 3结合沟的暴露,这是其与促凋亡蛋白相互作用所必需的。
The anti-apoptotic protein Bcl-xL regulates apoptosis by preventing the permeation of the mitochondrial outer membrane by pro-apoptotic pore-forming proteins, which release apoptotic factors into the cytosol that ultimately lead to cell death. Two different membrane-integrated Bcl-xL constructs have been identified: a membrane-anchored and a membrane-inserted conformation. Here, we use molecular dynamics simulations to study the effect of the mitochondrial specific lipid cardiolipin and the protein protonation state on the conformational dynamics of membrane-anchored Bcl-xL. The analysis reveals that the protonation state of the protein and cardiolipin content of the membrane modulate the orientation of the soluble head region (helices α1 through α7) and hence the exposure of its BH3-binding groove, which is required for its interaction with pro-apoptotic proteins.
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