title: Prostaglandin 9-ketoreductase from pig and human kidney: purification, properties and identity with human carbonyl reductase.
abstract: Prostaglandin 9-ketoreductase has been purified to apparent homogeneity from pig and human kidney with an overall yield of 6%. The enzyme has a molecular mass of 34 kDa, it is present as an active monomer in diluted solution and contains approx. 2 equivalents Zn++/mole enzyme. It is stereoselective for the pro(S) hydrogen of NADPH and reduces the prostaglandin 9-keto group to yield 90% prostaglandin F2 alpha and 8% of the beta-form. An extensive study of the catalytic properties was carried out, which leads to the conclusion that the enzyme function in vivo is unlikely a catalysis of oxidation/reduction at the prostaglandin 9-position. Five peptides from the pig kidney enzyme were sequenced and compared with the sequence of carbonyl reductase from human placenta. The identity is > 90% and this, together with the immunological cross-reactivity with human brain carbonyl reductase, most strongly suggests that prostaglandin 9-ketoreductase and carbonyl reductase are the same enzyme.
authors.affiliation: Universität Konstanz, Fakultät für Biologie, FRG.
authors.forename: A
authors.initials: A
authors.lastname: Schieber
authors.forename: S
authors.initials: S
authors.lastname: Ghisla
mesh_terms: D000429:Alcohol Oxidoreductases / Q000737:chemistry; D000449:Aldehyde Reductase; D000074408:Aldo-Keto Reductases; D000595:Amino Acid Sequence; D000818:Animals; D002384:Catalysis; D005260:Female; D006801:Humans; D006911:Hydroxyprostaglandin Dehydrogenases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D007668:Kidney / Q000201:enzymology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009249:NADP / Q000378:metabolism; D010446:Peptide Fragments / Q000737:chemistry; D010920:Placenta / Q000201:enzymology; D017386:Sequence Homology, Amino Acid; D013552:Swine; D015032:Zinc / Q000032:analysis
chemical_list: D010446:Peptide Fragments; D009249:NADP; D000429:Alcohol Oxidoreductases; D000074408:Aldo-Keto Reductases; D006911:Hydroxyprostaglandin Dehydrogenases; C035858:prostaglandin-E2 9-reductase; D000449:Aldehyde Reductase; D015032:Zinc