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エンドウ トシヤ
ENDO TOSHIYA
遠藤 斗志也 所属 京都産業大学 生命科学部 先端生命科学科 職種 客員教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2012/12 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Phosphatidylethanolamine Biosynthesis in Mitochondria PHOSPHATIDYLSERINE (PS) TRAFFICKING IS INDEPENDENT OF A PS DECARBOXYLASE AND INTERMEMBRANE SPACE PROTEINS UPS1P AND UPS2P |
| 執筆形態 | その他 |
| 掲載誌名 | JOURNAL OF BIOLOGICAL CHEMISTRY |
| 出版社・発行元 | AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC |
| 巻・号・頁 | 287(52),pp.43961-43971 |
| 著者・共著者 | Yasushi Tamura,Ouma Onguka,Kie Itoh,Toshiya Endo,Miho Iijima,Steven M. Claypool,Hiromi Sesaki |
| 概要 | Phosphatidylethanolamine (PE) plays important roles for the structure and function of mitochondria and other intracellular organelles. In yeast, the majority of PE is produced from phosphatidylserine (PS) by a mitochondrion-located PS decarboxylase, Psd1p. Because PS is synthesized in the endoplasmic reticulum (ER), PS is transported from the ER to mitochondria and converted to PE. After its synthesis, a portion of PE moves back to the ER. Two mitochondrial proteins located in the intermembrane space, Ups1p and Ups2p, have been shown to regulate PE metabolism by controlling the export of PE. It remains to be determined where PS is decarboxylated in mitochondria and whether decarboxylation is coupled to trafficking of PS. Here, using fluorescent PS as a substrate in an in vitro assay for Psd1p-dependent PE production in isolated mitochondria, we show that PS is transferred from the mitochondrial outer membrane to the inner membrane independently of Psd1p, Ups1p, and Ups2p and decarboxylated to PE by Psd1p in the inner membrane. Interestingly, Ups1p is required for the maintenance of Psd1p and therefore PE production. Restoration of Psd1p levels rescued PE production defects in ups1 Delta mitochondria. Our data provide novel mechanistic insight into PE biogenesis in mitochondria. |
| DOI | 10.1074/jbc.M112.390997 |
| ISSN | 0021-9258 |