A unified model of mammalian BCL-2 protein family interactions at the mitochondria.

A unified model of mammalian BCL-2 protein family interactions at the mitochondria.
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DOI:
10.1016/j.molcel.2011.10.001
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发表时间:
2011-11-18
期刊:
影响因子:
16
通讯作者:
Green DR
Green DR
中科院分区:
生物学1区
文献类型:
--
作者:
Llambi F;Moldoveanu T;Tait SW;Bouchier-Hayes L;Temirov J;McCormick LL;Dillon CP;Green DR

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在细胞凋亡过程中,BCL-2蛋白家族控制线粒体外膜透化(MOMP),但这种调节的动力学仍然存在争议。我们采用了由插入tBID骨架中的外源BH 3结构域组成的嵌合蛋白,其可以激活促凋亡效应物BAX和巴克以透化膜,而不被所有抗凋亡BCL-2蛋白普遍隔离。因此,我们鉴定了两种“模式”,其中促存活BCL-2蛋白可以通过螯合直接激活剂仅BH 3蛋白(“模式1”)或通过结合活性BAX和巴克(“模式2”)来阻断MOMP。值得注意的是,我们发现模式1螯合比模式2效率更低,更容易去抑制以促进MOMP。此外,MODE 2隔离防止线粒体融合。我们提供了一个BCL-2家族功能的统一模型,这有助于解释与MOMP、细胞凋亡和线粒体动力学相关的矛盾观察结果。
During apoptosis, the BCL-2 protein family controls Mitochondrial Outer Membrane Permeabilization (MOMP), but the dynamics of this regulation remains controversial. We employed chimeric proteins composed of exogenous BH3 domains inserted into a tBID backbone that can activate the pro-apoptotic effectors BAX and BAK to permeabilize membranes without being universally sequestered by all anti-apoptotic BCL-2 proteins. We thus identified two “modes” whereby pro-survival BCL-2 proteins can block MOMP, by sequestering direct activator BH3-only proteins (“MODE 1”) or by binding active BAX and BAK (“MODE 2”). Notably, we found that MODE 1 sequestration is less efficient and more easily de-repressed to promote MOMP than MODE 2. Further, MODE 2 sequestration prevents mitochondrial fusion. We provide a unified model of BCL-2 family function that helps to explain otherwise paradoxical observations relating to MOMP, apoptosis, and mitochondrial dynamics.
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