Dual role of USP30 in controlling basal pexophagy and mitophagy.

Dual role of USP30 in controlling basal pexophagy and mitophagy.
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DOI:
10.15252/embr.201745595
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发表时间:
2018-07
期刊:
影响因子:
7.7
通讯作者:
Urbé S
Urbé S
中科院分区:
生物学2区
文献类型:
--
作者:
Marcassa E;Kallinos A;Jardine J;Rusilowicz-Jones EV;Martinez A;Kuehl S;Islinger M;Clague MJ;Urbé S

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USP30 是线粒体外膜的整合蛋白,可在急性线粒体去极化后抵消 PINK1 和 Parkin 依赖性线粒体自噬。在这里,我们使用两个不同的线粒体自噬报告系统来揭示 USP30 对缺乏可检测到的 Parkin 的细胞中基础线粒体自噬的 PINK1 依赖性成分的强直抑制。我们提出 USP30 通过调节 PINK1 底物可用性而作用于 PINK1 上游,从而决定线粒体自噬启动的潜力。我们进一步表明,一部分内源性 USP30 独立靶向过氧化物酶体,以不依赖于 PINK1 和 Parkin 的方式调节基础 pexophagy。因此,我们揭示了 USP30 在清除哺乳动物细胞中两个主要 ROS 来源以及调节 PINK1 依赖性和 PINK1 独立选择性自噬途径中的关键作用。
USP30 is an integral protein of the outer mitochondrial membrane that counteracts PINK1 and Parkin‐dependent mitophagy following acute mitochondrial depolarisation. Here, we use two distinct mitophagy reporter systems to reveal tonic suppression by USP30, of a PINK1‐dependent component of basal mitophagy in cells lacking detectable Parkin. We propose that USP30 acts upstream of PINK1 through modulation of PINK1‐substrate availability and thereby determines the potential for mitophagy initiation. We further show that a fraction of endogenous USP30 is independently targeted to peroxisomes where it regulates basal pexophagy in a PINK1‐ and Parkin‐independent manner. Thus, we reveal a critical role of USP30 in the clearance of the two major sources of ROS in mammalian cells and in the regulation of both a PINK1‐dependent and a PINK1‐independent selective autophagy pathway.