title: Hysteretic behaviour of carnitine palmitoyltransferase. The effect of preincubation with malonyl-CoA.
abstract: Continuous assays of carnitine palmitoyltransferase were used to study the hysteretic behaviour of the enzyme. When reactions were started by adding mitochondria to complete reaction mixtures, there was a lag in the assay even in the absence of malonyl-CoA. When mitochondria were preincubated with malonyl-CoA in the absence of palmitoyl-CoA, there was a greater lag period in the assay of carnitine palmitoyltransferase, but this lag was less prominent at 37 degrees C than at 30 degrees C. Preincubation of mitochondria with malonyl-CoA did not change the sensitivity of the enzyme to inhibition by malonyl-CoA.
mesh_terms: D000214:Acyl Coenzyme A / Q000494:pharmacology*; D000217:Acyltransferases / Q000378:metabolism*; D000818:Animals; D002334:Carnitine O-Palmitoyltransferase / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D008316:Malonyl Coenzyme A / Q000378:metabolism / Q000494:pharmacology*; D008930:Mitochondria, Liver / Q000187:drug effects / Q000201:enzymology; D051381:Rats; D011919:Rats, Inbred Strains; D013696:Temperature
chemical_list: D000214:Acyl Coenzyme A; D008316:Malonyl Coenzyme A; D000217:Acyltransferases; D002334:Carnitine O-Palmitoyltransferase