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• W1609208791 abstract "CDP-diacylglycerol (CDP-DG) is an important branchpoint intermediate in eucaryotic phospholipid biosynthesis and could be a key regulatory site in phospholipid metabolism. Therefore, we examined the effects of growth phase, phospholipid precursors, and the disruption of phosphatidylcholine (PC) synthesis on the membrane-associated phospholipid biosynthetic enzymes CDP-DG synthase, phosphatidylglycerolphosphate (PGP) synthase, phosphatidylinositol (PI) synthase, and phosphatidylserine (PS) synthase in cell extracts of the fission yeast Schizosaccharomyces pombe. In complete synthetic medium containing inositol, maximal expression of CDP-DG synthase, PGP synthase, PI synthase, and PS synthase in wild-type cells occurred in the exponential phase of growth and decreased two- to fourfold in the stationary phase of growth. In cells starved for inositol, this decrease in PGP synthase, PI synthase, and PS synthase expression was not observed. Starvation for inositol resulted in a twofold derepression of PGP synthase and PS synthase expression, while PI synthase expression decreased initially and then remained constant. Upon the addition of inositol to inositol-starved cells, there was a rapid and continued increase in PI synthase expression. We examined expression of these enzymes in cho2 and cho1 mutants, which are blocked in the methylation pathway for synthesis of PC. Choline starvation resulted in a decrease in PS synthase and CDP-DG synthase expression in cho1 but not cho2 cells. Expression of PGP synthase and PI synthase was not affected by choline starvation. Inositol starvation resulted in a 1.7-fold derepression of PGP synthase expression in cho2 but not cho1 cells when PC was synthesized. PS synthase expression was not depressed, while CDP-DG synthase and PI synthase expression decreased in cho2 and cho1 cells in the absence of inositol. These results demonstrate that (i) CDP-DG synthase, PGP synthase, PI synthase, and PS synthase are similarly regulated by growth phase; (ii) inositol affects the expression of PGP synthase, PI synthase, and PS synthase; (iii) disruption of the methylation pathway results in aberrant patterns of regulation of growth phase and phospholipid precursors. Important differences between S. pombe and Saccharomyces cerevisiae with regard to regulation of these enzymes are discussed." @default.
• W1609208791 created "2016-06-24" @default.
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• W1609208791 date "1992-09-01" @default.
• W1609208791 modified "2023-09-23" @default.
• W1609208791 title "Regulation of CDP-diacylglycerol synthesis and utilization by inositol and choline in Schizosaccharomyces pombe" @default.
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• W1609208791 doi "https://doi.org/10.1128/jb.174.17.5711-5718.1992" @default.
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