title: Guinea pig liver 3-hydroxyhexobarbital dehydrogenase. Purification and properties.
abstract: 3-Hydroxyhexobarbital dehydrogenase, which catalyzes the reversible oxidation of 3-hydroxyhexobarbital to 3-oxohexobarbital, has been purified 470-fold from the soluble fraction of guinea pig liver with a yield of 47%. The specific activity of the purified enzyme is 9.4 units/mg of protein. Results of polyacrylamide gel disc electrophoresis and isoelectric focusing indicated that the purified enzyme preparation is a single and homogeneous protein. NADP+ served as preferred co-factor, but NAD+ is also utilized in the presence of phosphate ion. The guinea pig liver enzyme possessed a relatively narrow substrate specificity in comparison with the rabbit liver enzyme. It is very distinctive that guinea pig liver 3-hydroxyhexobarbital dehydrogenase catalyzes the dehydrogenation of 17beta-hydroxysteroids such as testosterone, 4-androstene-3beta,17beta-diol, 5alpha-androstane-3alpha,17beta-diol, 5alpha-androstane-3beta,17beta-diol, 5alpha-androstan-17beta-ol-3-one, and 5beta-androstane-3alpha,17beta-diol.
mesh_terms: D000311:Adrenal Glands / Q000201:enzymology; D000429:Alcohol Oxidoreductases / Q000302:isolation & purification / Q000378:metabolism*; D000818:Animals; D002845:Chromatography; D004285:Dogs; D004589:Electrophoresis, Disc; D006168:Guinea Pigs; D006591:Hexobarbital / Q000031:analogs & derivatives; D006863:Hydrogen-Ion Concentration; D006913:Hydroxysteroid Dehydrogenases / Q000378:metabolism; D007525:Isoelectric Focusing; D007668:Kidney / Q000201:enzymology; D007700:Kinetics; D008099:Liver / Q000201:enzymology; D008168:Lung / Q000201:enzymology; D051379:Mice; D008970:Molecular Weight; D009243:NAD / Q000494:pharmacology; D009249:NADP / Q000494:pharmacology; D010710:Phosphates / Q000494:pharmacology; D011817:Rabbits; D051381:Rats
chemical_list: D010710:Phosphates; D009243:NAD; D009249:NADP; D006591:Hexobarbital; D000429:Alcohol Oxidoreductases; D006913:Hydroxysteroid Dehydrogenases