Tam41 is a CDP-diacylglycerol Synthase Required for Cardiolipin Biosynthesis in Mitochondria

Overview

Journal Cell Metab

Publisher Cell Press

Specialties Cell Biology
Endocrinology

Date 2013 Apr 30

PMID 23623749

Citations 77

Authors

Yasushi Tamura

Yoshihiro Harada

Shuh-Ichi Nishikawa

Koji Yamano

Megumi Kamiya

Takuya Shiota

Takuya Kuroda

Osamu Kuge

Hiromi Sesaki

Kenichiro Imai

Kentaro Tomii

Toshiya Endo

Affiliations

Soon will be listed here.

Abstract

CDP-diacylglycerol (CDP-DAG) is central to the phospholipid biosynthesis pathways in cells. A prevailing view is that only one CDP-DAG synthase named Cds1 is present in both the endoplasmic reticulum (ER) and mitochondrial inner membrane (IM) and mediates generation of CDP-DAG from phosphatidic acid (PA) and CTP. However, we demonstrate here by using yeast Saccharomyces cerevisiae as a model organism that Cds1 resides in the ER but not in mitochondria, and that Tam41, a highly conserved mitochondrial maintenance protein, directly catalyzes the formation of CDP-DAG from PA in the mitochondrial IM. We also find that inositol depletion by overexpressing an arrestin-related protein Art5 partially restores the defects of cell growth and CL synthesis in the absence of Tam41. The present findings unveil the missing step of the cardiolipin synthesis pathway in mitochondria as well as the flexibile regulation of phospholipid biosynthesis to respond to compromised CDP-DAG synthesis in mitochondria.

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