A stress-responsive system for mitochondrial protein degradation.

A stress-responsive system for mitochondrial protein degradation.
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DOI:
10.1016/j.molcel.2010.10.021
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发表时间:
2010-11-12
期刊:
影响因子:
16
通讯作者:
Rutter J
Rutter J
中科院分区:
生物学1区
文献类型:
--
作者:
Heo JM;Livnat-Levanon N;Taylor EB;Jones KT;Dephoure N;Ring J;Xie J;Brodsky JL;Madeo F;Gygi SP;Ashrafi K;Glickman MH;Rutter J

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我们表明,Ydr 049(更名为VCP/Cdc 48相关线粒体应激反应-Vms 1),一个未研究的泛真核蛋白家族的成员,易位从细胞质线粒体应激。缺乏Vms 1的细胞表现出进行性线粒体衰竭、对氧化应激的超敏反应和减少的时间寿命。酵母和哺乳动物Vms 1都与Cdc 48/ VCP/ p97稳定相互作用,Cdc 48/ VCP/ p97是泛素/蛋白酶体系统的一种组分,在内质网相关蛋白降解(ERAD)中具有明确的作用,其中错误折叠的ER蛋白在胞质溶胶中降解。我们发现,氧化应激触发Cdc 48的线粒体定位,这是依赖于Vms 1。当该系统被Vms 1的突变损害时,泛素依赖的线粒体蛋白降解、线粒体呼吸功能和细胞活力受到损害。我们证明,Vms 1是一个进化保守的线粒体蛋白质降解系统,这是必要的,以维持线粒体,细胞和生物体的生存能力所需的组成部分。
We show that Ydr049 (renamed VCP/ Cdc48-associated Mitochondrial Stress-responsive—Vms1), a member of an unstudied pan-eukaryotic protein family, translocates from the cytosol to mitochondria upon mitochondrial stress. Cells lacking Vms1 show progressive mitochondrial failure, hypersensitivity to oxidative stress and decreased chronological lifespan. Both yeast and mammalian Vms1 stably interact with Cdc48/ VCP/ p97, a component of the ubiquitin/ proteasome system with a well-defined role in endoplasmic reticulum-associated protein degradation (ERAD), wherein misfolded ER proteins are degraded in the cytosol. We show that oxidative stress triggers mitochondrial localization of Cdc48 and this is dependent on Vms1. When this system is impaired by mutation of Vms1, ubiquitin-dependent mitochondrial protein degradation, mitochondrial respiratory function and cell viability are compromised. We demonstrate that Vms1 is a required component of an evolutionarily conserved system for mitochondrial protein degradation, which is necessary to maintain mitochondrial, cellular and organismal viability.
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