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- W88260568 abstract "Endosperm halves from 3-day-old castor bean (Ricinus communis var Hale) were incubated for 30 minutes with L(/sup 14/C)serine, after which label was observed in ethanolamine, choline, phosphatidylserine, phosphatidylethanolamine, phosphatidylcholine, ethanolaminephosphate, and CDPethanolamine, but not in cholinephosphate or CDPcholine. Only later did significant amounts of isotope become incorporated into cholinephosphate and CDPcholine. The choline kinase inhibitor hemicholinium-3 prevented the incorporation of label from serine into choline-phosphate and CDPcholine, reduced the incorporation of (/sup 14/C)choline into phosphatidylcholine by 65%, but inhibited the incorporation of label into phosphatidylcholine from serine by only 15%. The inhibitor did not prevent the incorporation of labeled methyl groups from S-adenosyl-L-methionine into phosphatidyldimethylethanolamine plus phosphatidyl-choline. The amount of incorporation of label from the methyl donor was only 8% of that from choline into phosphatidylcholine. The implications of these results for the pathway and regulation of phosphatidylcholine synthesis from the water-soluble precursors are discussed." @default.
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- W88260568 date "1987-05-01" @default.
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- W88260568 title "Phosphatidylcholine synthesis in castor bean endosperm. I. Metabolism of L-serine. [Ricinus communis]" @default.
- W88260568 hasPublicationYear "1987" @default.
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