PMID: 639815Apr 1, 1978Paper

Effect of choline deficiency on the enzymes that synthesize phosphatidylcholine and phosphatidylethanolamine in rat liver

European Journal of Biochemistry
W J Schneider, Dennis E Vance

Abstract

Activities have been determined in subcellular fractions of livers from choline-deficient and normals rats for the enzymes that convert choline and ethanolamine to phosphatidylcholine and phosphatidylethanolamine respectively, that methylate phosphatidylethanolamine to yield phosphatidylcholine, and that oxidize choline to betaine. The activities of ethanolamine kinase, phosphoethanolamine cytidylyltransferase, and CDP-ethanolamine: 1,2-diacylglycerol phosphoethanolaminetransferase are not changed in the livers from choline-deficient rats for at least 18 days. Similarly, the activities of choline kinase and CDP-choline: 1,2-diacylglycerol phosphocholine transferase were unaffected by choline depletion. A decrease of 30-41% was observed, however, in the mitochondrial oxidation of choline to betaine. Also, the activity of the phosphocholine cytidylyltransferase was reduced in the choline-deficient livers to 60% olf the control values. The only observed increase in enzyme activity was a 62% elevation of the phosphatidylethanolamine-S-adenosylmethionine methyltransferase activity after 2 days of choline deficiency. This increased activity was maintained for at least 18 days of choline deprivation. The results suggest a lack of adap...Continue Reading

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