Assay of L-3-hydroxyacyl-coenzyme A dehydrogenase with substrates of different chain lengths

Anal Biochem. 1989 Jul;180(1):105-9. doi: 10.1016/0003-2697(89)90095-x.

Abstract

A method for assaying L-3-hydroxyacyl-CoA dehydrogenase (EC 1.1.1.35) which permits rate measurements with L-3-hydroxyacyl-CoA substrates of various chain lengths at physiological pH is described. The method is based on a coupled assay system in which 3-ketoacyl-CoA compounds formed by the dehydrogenase are cleaved by 3-ketoacyl-CoA thiolase (EC 2.3.1.16) in the presence of CoASH. The advantages of this assay method are its irreversibility and elimination of product inhibition. The assay procedure was used to determine the kinetic parameters (Km, Vmax) of pig heart L-3-hydroxyacyl-CoA dehydrogenase with several substrates of various chain lengths. The data obtained show the enzyme to be most active with medium-chain substrates whereas Km values for medium-chain and long-chain substrates are almost equal but much lower than those previously reported.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • 3-Hydroxyacyl CoA Dehydrogenases / metabolism*
  • Acyl Coenzyme A / metabolism*
  • Animals
  • Hydrogen-Ion Concentration
  • In Vitro Techniques
  • Kinetics
  • Myocardium / enzymology
  • Serum Albumin / pharmacology
  • Substrate Specificity
  • Swine

Substances

  • Acyl Coenzyme A
  • Serum Albumin
  • 3-Hydroxyacyl CoA Dehydrogenases