Inhibition of phosphatidylethanolamine biosynthesis in baby hamster kidney-21 cells infected with Semliki Forest virus.
Semliki Forest virus inhibits phosphatidylethanolamine biosynthesis in baby hamster kidney-21 cells 6 h after infection. Viral infection reduced the incorporation of [1,2-14C]-ethanolamine into intact cells by approximately 50%. A similar reduction in the activity of the ethanolaminephosphotransferase (EC 2.7.8.1) was also observed. The apparent Km for CDPethanolamine was 60 muM for the microsomal enzymes from infected or mock-infected cells. In addition, exogenous diglyceride only stimulated by 1.5-fold the ethanolaminephosphotransferase from virus- or mock-infected cells, whereas the same diglyceride preparations stimulated the cholinephosphotransferase (EC 2.7.8.2) from baby hamster kidney cells by sixfold. Generation of endogenous diglyceride by pretreatment of the microsomes with phospholipase C (EC 3.1.4.3) stimulated the activity of the cholinephosphotransferase but not the ethanolaminephosphotranferase. Semliki Forest virus does not inhibit all microsomal enzymes, since the activities of NADH- K3Fe(CN)6 reductase and NADH dehydrogenase (EC 1.6.99.3) were not affected. The ethanolaminephosphotransferase from virus- and mock-infected cells showed similar profiles of activity as a function of temperature; this result and other studies suggest that that membranous environment of the ethanolaminephosphotransferase was not significantly modified by the virus.
D002460:Cell Line; D003597:Cytosine Nucleotides; D002798:Diacylglycerol Cholinephosphotransferase / Q000378:metabolism; D004983:Ethanolamines / Q000378:metabolism; D007700:Kinetics; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism; D010714:Phosphatidylethanolamines / Q000096:biosynthesis*; D010770:Phosphotransferases / Q000378:metabolism; D012672:Semliki forest virus / Q000378:metabolism*; D013696:Temperature
D003597:Cytosine Nucleotides; D004983:Ethanolamines; D010714:Phosphatidylethanolamines; D009247:NADH, NADPH Oxidoreductases; D010770:Phosphotransferases; D002798:Diacylglycerol Cholinephosphotransferase