Protein import motor complex reacts to mitochondrial misfolding by reducing protein import and activating mitophagy.

Protein import motor complex reacts to mitochondrial misfolding by reducing protein import and activating mitophagy.
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DOI:
10.1038/s41467-022-32564-x
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发表时间:
2022-09-02
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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线粒体自噬对维持线粒体功能和预防疾病至关重要。它在线粒体去极化时激活,这导致PINK 1稳定在线粒体外膜上。引人注目的是,许多条件,包括线粒体蛋白质错误折叠,可以诱导线粒体自噬而不损失膜电位。潜在的分子细节仍不清楚。在这里,我们报告说,线粒体蛋白进口的损失,介导的前序列易位酶相关的电机复合物PAM,足以诱导线粒体自噬极化线粒体。线粒体自噬诱导剂的全基因组CRISPR/Cas9筛选鉴定PAM复合物的组分。蛋白质输入缺陷能够诱导线粒体自噬而不需要去极化。在线粒体蛋白质错误折叠时,PAM从输入机制中解离,导致蛋白质输入减少和线粒体自噬诱导。我们的研究结果扩展了目前的线粒体自噬模型,以解释线粒体自噬诱导的条件下,不影响膜极化,如线粒体蛋白质错误折叠。线粒体自噬激活是由线粒体去极化介导的。在这里,作者表明,线粒体蛋白质错误折叠可以激活线粒体自噬在去极化独立的方式介导的蛋白质输入减少。
Mitophagy is essential to maintain mitochondrial function and prevent diseases. It activates upon mitochondria depolarization, which causes PINK1 stabilization on the mitochondrial outer membrane. Strikingly, a number of conditions, including mitochondrial protein misfolding, can induce mitophagy without a loss in membrane potential. The underlying molecular details remain unclear. Here, we report that a loss of mitochondrial protein import, mediated by the pre-sequence translocase-associated motor complex PAM, is sufficient to induce mitophagy in polarized mitochondria. A genome-wide CRISPR/Cas9 screen for mitophagy inducers identifies components of the PAM complex. Protein import defects are able to induce mitophagy without a need for depolarization. Upon mitochondrial protein misfolding, PAM dissociates from the import machinery resulting in decreased protein import and mitophagy induction. Our findings extend the current mitophagy model to explain mitophagy induction upon conditions that do not affect membrane polarization, such as mitochondrial protein misfolding. Mitophagy activation is mediated by mitochondrial depolarization. Here, the authors show that mitochondrial protein misfolding can activate mitophagy in a depolarization-independent manner mediated by a protein import reduction.
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