Synthesis of acyl-S-pantetheine by rat liver microsomes.
The synthesis of acyl-S-pantetheine was found to occur in rat liver microsomal preparations. The reaction required ATP and a metal ion as cofactors, a fatty acid and the reduced form of pantetheine for optimal activity. The Km for pantetheine was 0.8 mM, for ATP 0.8 mM, and for oleic acid 0.3 mM. Mg2+ (20mM), Mn2+ (5 mM), Ca2+ (5mM), and Fe2+ (5 mM) produced approximately equal activity when all other conditions were optimal. The characterization of the product and other properties of the enzyme are described. The acyl-S-pantetheine formed does not act as an acyl donor in the acylation of sn-glycerol-3-phosphate, 1,2-diacylglycerol, or lysolecithin.
D000818:Animals; D002413:Cations, Divalent; D007700:Kinetics; D008274:Magnesium / Q000494:pharmacology; D008297:Male; D008345:Manganese / Q000494:pharmacology; D008862:Microsomes, Liver / Q000378:metabolism*; D010204:Pantetheine / Q000031:analogs & derivatives* / Q000378:metabolism; D051381:Rats; D013438:Sulfhydryl Compounds / Q000031:analogs & derivatives*
D002413:Cations, Divalent; D013438:Sulfhydryl Compounds; D008345:Manganese; D010204:Pantetheine; D008274:Magnesium