title: Microbial metabolism of quinoline and related compounds. XIV. Purification and properties of 1H-3-hydroxy-4-oxoquinoline oxygenase, a new extradiol cleavage enzyme from Pseudomonas putida strain 33/1.
abstract: 1H-3-Hydroxy-4-oxoquinoline oxygenase was purified to apparent homogeneity from Pseudomonas putida strain 33/1 which can use 1H-4-oxoquinoline as sole source of carbon. The molecular mass of the enzyme was determined to 26,000 Da by gel chromatography and by SDS polyacrylamide gel electrophoresis. The enzyme is labile at temperatures above 30 degrees C and has a pH optimum of 8.0. It requires oxygen for the reaction and is significantly inhibited by metal ions like Cu2+, Zn2+, Hg2+ and by 4-chloromercuribenzoate. The enzyme is specific only for 1H-3-Hydroxy-4-oxoquinoline; the apparent Km value for this substrate is 24 microM.
authors.affiliation: Institut für Mikrobiologie, Universität Hohenheim.
authors.forename: D W
authors.initials: DW
authors.lastname: Block
authors.forename: F
authors.initials: F
authors.lastname: Lingens
mesh_terms: D000595:Amino Acid Sequence; D002413:Cations, Divalent / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D007700:Kinetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010084:Oxidation-Reduction; D010101:Oxygen Consumption; D010105:Oxygenases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D016958:Pseudomonas putida / Q000201:enzymology*; D013056:Spectrophotometry, Ultraviolet; D013379:Substrate Specificity; D013696:Temperature
chemical_list: D002413:Cations, Divalent; D010105:Oxygenases; C076450:3-hydroxy-4-oxoquinoline oxygenase