Mdm35p imports Ups proteins into the mitochondrial intermembrane space by functional complex formation.
Mdm35p imports Ups proteins into the mitochondrial intermembrane space by functional complex formation.
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Mdm35p 通过功能复合物的形成将 Ups 蛋白导入线粒体膜间隙。
DOI:
10.1038/emboj.2010.149
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Sesaki,Hiromi
中科院分区:
文献类型:
--
作者:
Tamura,Yasushi;Iijima,Miho;Sesaki,Hiromi
Ups1p, Ups2p, and Ups3p are three homologous proteins that control phospholipid metabolism in the mitochondrial intermembrane space (IMS). The Ups proteins are atypical IMS proteins in that they lack the two major IMS‐targeting signals, bipartite presequences and cysteine motifs. Here, we show that Ups protein import is mediated by another IMS protein, Mdm35p.In vitroimport assays show that import of Ups proteins requires Mdm35p. Loss of Mdm35p led to a decrease in steady state levels of Ups proteins in mitochondria. In addition,mdm35Δ cells displayed a similar phenotype toups1Δups2Δups3Δ cells. Interestingly, unlike typical import machineries, Mdm35p associated stably with Ups proteins at a steady state after import. Demonstrating that Mdm35p is a functional component of Ups–Mdm35p complexes, restoration of Ups protein levels inmdm35Δ mitochondria failed to restore phospholipid metabolism. These findings provide a novel mechanism in which the formation of functional protein complexes drives mitochondrial protein import.
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作者:
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DOI:
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发表时间:
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期刊:
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