Abstract

InNeurospora crassa, phospholipids containing ethanolamine, monomethylaminoethanol, dimethylaminoethanol and choline are formed by a pathway involving cytidine nucleotides. The rate of formation of these phospholipids does not appear to be dependent on the fatty acid composition of diacylglycerols acting as acceptors of phosphorylated aminoethanols. The presence of choline in the growth medium represses the activity of enzymes of the methylation pathway for the biosynthesis of 1,2-diacyl-sn-glycero-3-phosphorylcholine (diacyl-GPCh) and induces the activity of enzymes of the cytidine mechanism.

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