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• W1986595278 endingPage "332" @default.
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• W1986595278 abstract "Phosphatidylethanolamine methyltransferase (PEMT) and phospholipid methyltransferase (PLMT), which are encoded by the CHO2 and OP13 genes, respectively, catalyze the three-step methylation of phosphatidylethanolamine to phosphatidylcholine in Saccharomyces cerevisiae. Regulation of PEMT and PLMT as well as CHO2 mRNA and OPI3 mRNA abundance was examined in S. cerevisiae cells supplemented with phospholipid precursors. The addition of choline to inositol-containing growth medium repressed the levels of CHO2 mRNA and OPI3 mRNA abundance in wild-type cells. The major effect on the levels of the CHO2 mRNA and OPI3 mRNA occurred in response to inositol. Regulation was also examined in cho2 and opi3 mutants, which are defective in PEMT and PLMT activities, respectively. These mutants can synthesize phosphatidylcholine when they are supplemented with choline by the CDP-choline-based pathway but they are not autotrophic for choline. CHO2 mRNA and OPI3 mRNA were regulated by inositol plus choline in opi3 and cho2 mutants, respectively. However, there was no regulation in response to inositol when the mutants were not supplemented with choline. This analysis showed that the regulation of CHO2 mRNA and OPI3 mRNA abundance by inositol required phosphatidylcholine synthesis by the CDP-choline-based pathway. The regulation of CHO2 mRNA and OPI3 mRNA abundance generally correlated with the activities of PEMT and PLMT, respectively. CDP-diacylglycerol synthase and phosphatidylserine synthase, which are regulated by inositol in wild-type cells, were examined in the cho2 and opi3 mutants. Phosphatidylcholine synthesis was not required for the regulation of CDP-diacylglycerol synthase and phosphatidylserine synthase by inositol." @default.
• W1986595278 created "2016-06-24" @default.
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• W1986595278 date "1991-11-01" @default.
• W1986595278 modified "2023-10-15" @default.
• W1986595278 title "Regulation of phosphatidylethanolamine methyltransferase and phospholipid methyltransferase by phospholipid precursors in Saccharomyces cerevisiae" @default.
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• W1986595278 doi "https://doi.org/10.1016/0167-4781(91)90197-t" @default.
• W1986595278 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1954254" @default.
• W1986595278 hasPublicationYear "1991" @default.
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