VPS13D bridges the ER to mitochondria and peroxisomes via Miro.

VPS13D bridges the ER to mitochondria and peroxisomes via Miro.
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DOI:
10.1083/jcb.202010004
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发表时间:
2021-05-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
De Camilli P
De Camilli P
中科院分区:
其他
文献类型:
--
作者:
Guillén-Samander A;Leonzino M;Hanna MG;Tang N;Shen H;De Camilli P

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VPS 13 D突变导致严重的线粒体缺陷。Guillén-Samander等人表明,VPS 13 D结合ER中的VAP,并与线粒体和过氧化物酶体上的Miro相互作用,在那里它可以为这些细胞器之间的脂质转运提供桥梁。被排除在分泌途径之外的线粒体依赖于脂质转运蛋白从ER供应脂质,大多数脂质在ER合成。在酵母中,线粒体外膜GTp 1Gem 1是ERMES的辅助因子,ERMES是一种ER-线粒体系留复合物,含有脂质转运结构域,与Vps 13部分冗余地在两个细胞器之间的脂质转移中发挥作用。在后生动物中,VPS 13,但不是ERMES,存在,Gem 1直系同源米罗与线粒体动力学,但不与脂质运输。在这里,我们表明Miro(包括其富含过氧化物酶体的剪接变体)招募脂质转运蛋白VPS 13 D,后者反过来以VAP依赖性方式结合ER,从而可以在ER和线粒体之间提供脂质管道。这些发现揭示了迄今为止酵母和高等真核生物中Gem 1/Miro功能之间缺失的联系,其中Miro是Parkin底物,对帕金森病发病机制具有潜在意义。
VPS13D mutations result in severe mitochondrial defects. Guillén-Samander et al. show that VPS13D binds VAP in the ER and interacts with Miro on mitochondria and peroxisomes, where it could provide a bridge for lipid transport between these organelles. Mitochondria, which are excluded from the secretory pathway, depend on lipid transport proteins for their lipid supply from the ER, where most lipids are synthesized. In yeast, the outer mitochondrial membrane GTPase Gem1 is an accessory factor of ERMES, an ER–mitochondria tethering complex that contains lipid transport domains and that functions, partially redundantly with Vps13, in lipid transfer between the two organelles. In metazoa, where VPS13, but not ERMES, is present, the Gem1 orthologue Miro was linked to mitochondrial dynamics but not to lipid transport. Here we show that Miro, including its peroxisome-enriched splice variant, recruits the lipid transport protein VPS13D, which in turn binds the ER in a VAP-dependent way and thus could provide a lipid conduit between the ER and mitochondria. These findings reveal a so far missing link between function(s) of Gem1/Miro in yeast and higher eukaryotes, where Miro is a Parkin substrate, with potential implications for Parkinson’s disease pathogenesis.
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