title: Oxidative stress response in yeast: purification and characterization of glutathione reductase from Hansenula mrakii.
abstract: Glutathione reductase was purified from a yeast. Hansenula mrakii IFO 0895, to approximately 3500-fold with 59% activity yield. The enzyme was homogeneous on polyacrylamide gel electrophoresis. The molecular weight of the enzyme was estimated to be 56 kDa by SDS-polyacrylamide gel electrophoresis, and 123 kDa by gel filtration using a calibrated Sephadex G-150 column. The Km values for glutathione disulfide and NADPH were 21.3 microM and 14.3 microM, respectively. The enzyme was most active at pH 7.5, 55 degrees C. The enzyme was stable up to 40 degrees C, and between pHs 4 and 10. The enzyme was inhibited by p-chloromercuribenzoate and metal ions such as Fe3+, Cd2+, Cu2+, and Zn2+.
authors.affiliation: Research Institute for Food Science, Kyoto University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Miki
authors.forename: Y
authors.initials: Y
authors.lastname: Tsujimoto
authors.forename: S
authors.initials: S
authors.lastname: Miyabe
authors.forename: K
authors.initials: K
authors.lastname: Sugiyama
authors.forename: S
authors.initials: S
authors.lastname: Izawa
authors.forename: Y
authors.initials: Y
authors.lastname: Inoue
authors.forename: A
authors.initials: A
authors.lastname: Kimura
mesh_terms: D002729:Chloromercuribenzoates / Q000494:pharmacology; D002848:Chromatography, DEAE-Cellulose; D005285:Fermentation; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008670:Metals / Q000494:pharmacology; D008970:Molecular Weight; D018384:Oxidative Stress / Q000502:physiology*; D010843:Pichia / Q000201:enzymology / Q000378:metabolism*; D013439:Sulfhydryl Reagents / Q000494:pharmacology; D020245:p-Chloromercuribenzoic Acid
chemical_list: D002729:Chloromercuribenzoates; D008670:Metals; D013439:Sulfhydryl Reagents; D020245:p-Chloromercuribenzoic Acid; D005980:Glutathione Reductase; D005978:Glutathione