Broad activation of the ubiquitin-proteasome system by Parkin is critical for mitophagy.

Broad activation of the ubiquitin-proteasome system by Parkin is critical for mitophagy.
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Parkin对泛素 - 蛋白酶体系统的广泛激活对于线粒体至关重要。

DOI:
10.1093/hmg/ddr048
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发表时间:
2011-05-01
影响因子:
3.5
通讯作者:
Chan DC
Chan DC
中科院分区:
生物学2区
文献类型:
--
作者:
Chan NC;Salazar AM;Pham AH;Sweredoski MJ;Kolawa NJ;Graham RL;Hess S;Chan DC

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Parkin是一种参与帕金森病的E3泛素连接酶,通过自噬促进功能障碍的线粒体的降解。使用蛋白质组学和细胞的方法,我们表明,在易位到线粒体,帕金激活泛素-蛋白酶体系统(UPS)的外膜蛋白的广泛降解。这通过线粒体上K48连接的多聚泛素的增加、26 S蛋白酶体的募集和多种外膜蛋白的快速降解来证明。UPS对蛋白质的降解独立于自噬途径发生,并且26 S蛋白酶体的抑制完全消除了HeLa、SH-SY 5 Y和小鼠细胞中的Parkin介导的线粒体自噬。虽然线粒体融合蛋白Mfn 1和Mfn 2是帕金的快速降解靶点,但我们发现其他靶点的降解对线粒体自噬至关重要。这些结果表明,线粒体外膜蛋白质组的重塑是重要的线粒体自噬,并揭示了UPS和自噬,细胞内底物降解的主要途径之间的因果关系。
Parkin, an E3 ubiquitin ligase implicated in Parkinson's disease, promotes degradation of dysfunctional mitochondria by autophagy. Using proteomic and cellular approaches, we show that upon translocation to mitochondria, Parkin activates the ubiquitin–proteasome system (UPS) for widespread degradation of outer membrane proteins. This is evidenced by an increase in K48-linked polyubiquitin on mitochondria, recruitment of the 26S proteasome and rapid degradation of multiple outer membrane proteins. The degradation of proteins by the UPS occurs independently of the autophagy pathway, and inhibition of the 26S proteasome completely abrogates Parkin-mediated mitophagy in HeLa, SH-SY5Y and mouse cells. Although the mitofusins Mfn1 and Mfn2 are rapid degradation targets of Parkin, we find that degradation of additional targets is essential for mitophagy. These results indicate that remodeling of the mitochondrial outer membrane proteome is important for mitophagy, and reveal a causal link between the UPS and autophagy, the major pathways for degradation of intracellular substrates.
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发表时间: 2010-11-16
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影响因子: 13.3
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Narendra, Derek P.;Kane, Lesley A.;Youle, Richard J.
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