Abstract:
:The extensive subcellular network of membrane contact sites plays central roles in organelle biogenesis and communication, yet the precise contributions of the involved machineries remain largely enigmatic. The yeast vacuole forms a membrane contact site with mitochondria, called vacuolar and mitochondrial patch (vCLAMP). Formation of vCLAMPs involves the vacuolar Rab GTPase Ypt7 and the Ypt7-interacting Vps39 subunit of the HOPS tethering complex. Here, we uncover the general preprotein translocase of the outer membrane (TOM) subunit Tom40 as the direct binding partner of Vps39 on mitochondria. We identify Vps39 mutants defective in TOM binding, but functional for HOPS. Cells that cannot form vCLAMPs show reduced growth under stress conditions and impaired survival upon starvation. Unexpectedly, our mutant analysis revealed the existence of two functionally independent vacuole-mitochondria MCSs: one formed by the Ypt7-Vps39-Tom40 tether and a second one by Vps13-Mcp1, which is redundant with ER-mitochondrial contacts formed by ERMES.
journal_name
Dev Celljournal_title
Developmental cellauthors
González Montoro A,Auffarth K,Hönscher C,Bohnert M,Becker T,Warscheid B,Reggiori F,van der Laan M,Fröhlich F,Ungermann Cdoi
10.1016/j.devcel.2018.05.011subject
Has Abstractpub_date
2018-06-04 00:00:00pages
621-636.e7issue
5eissn
1534-5807issn
1878-1551pii
S1534-5807(18)30368-Xjournal_volume
45pub_type
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