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  • Title: Characterization of phosphatidylserine synthase from Saccharomyces cerevisiae and a mutant defective in the enzyme.
    Author: Nikawa JI, Yamashita S.
    Journal: Biochim Biophys Acta; 1981 Sep 24; 665(3):420-6. PubMed ID: 6271228.
    Abstract:
    The membrane fraction of exponentially growing cells of Saccharomyces cerevisiae was found to exhibit phosphatidylserine synthase activity. The enzyme was solubilized by Triton X-100 and chromatographed on a Sepharose 6B column. The enzyme had a pH optimum between 8.0 and 8.5. The apparent Km values for CDPdiacylglycerol and L-serine were 0.12 and 13 mM, respectively. Triton X-100 stimulated the enzyme. Mg2+ or Mn2+ was required for the activity. Ca2+ was inhibitory at relatively low concentrations. The enzyme was highly specific to L-serine. Labeling experiments showed that the enzyme synthesized phosphatidylserine by transferring the phosphatidyl moiety to L-serine. A mutant of S. cerevisiae defective in phosphatidylserine synthase was isolated. The strain required ethanolamine for its growth. Ethanolamine could be substituted by choline or high concentrations of L-serine. The mutant showed normal levels of CDPdiacylglycerol-inositol 3-phosphatidyltransferase and phosphatidylethanolamine methyltransferase activities.
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