Abstract
Using highly enriched membrane preparations from lactate-grown Saccharomyces cerevisiae cells, the subcellular and submitochondrial location of eight enzymes involved in the biosynthesis of phospholipids was determined. Phosphatidylserine decarboxylase and phosphatidylglycerolphosphate synthase were localized exclusively in the inner mitochondrial membrane, while phosphatidylethanolamine methyltransferase activity was confined to microsomal fractions. The other five enzymes tested in this study were common both to the outer mitochondrial membrane and to microsomes. The transmembrane orientation of the mitochondrial enzymes was investigated by protease digestion of intact mitochondria and of outside-out sealed vesicles of the outer mitochondrial membrane. Glycerolphosphate acyltransferase, phosphatidylinositol synthase, and phosphatidylserine synthase were exposed at the cytosolic surface of the outer mitochondrial membrane. Cholinephosphotransferase was apparently located at the inner aspect or within the outer mitochondrial membrane. Phosphatidate cytidylyltransferase was localized in the endoplasmic reticulum, on the cytoplasmic side of the outer mitochondrial membrane, and in the inner mitochondrial membrane. Inner membrane activity of this enzyme constituted 80% of total mitochondrial activity; inactivation by trypsin digestion was observed only after preincubation of membranes with detergent (0.1% Triton X-100). Total activity of those enzymes that are common to mitochondria and the endoplasmic reticulum was about equally distributed between the two organelles. Data concerning susceptibility to various inhibitors, heat sensitivity, and the pH optima indicate that there is a close similarity of the mitochondrial and microsomal enzymes that catalyze the same reaction.
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