The addition of ethanolamine or choline to inositol-containing growth medium resulted in a reduction of CTP:phosphatidate cytidylyltransferase (CDP-diacylglycerol synthase; EC 2.7.7.41) activity in Saccharomyces cerevisiae. The reduction of activity did not occur in the absence of inositol. CDP-diacylglycerol synthase activity was not regulated in a S. cerevisiae mutant strain (opi1; an inositol biosynthesis regulatory mutant) by the addition of phospholipid precursors to the growth medium.
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Homann et al. (1985) studied this question.
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