Purification and characterization of sulochrin oxidase from Penicillium frequentans.
Sulochrin oxidase, an enzyme catalyzing regio- and stereospecific phenol oxidative coupling reaction to form (+)-bisdechlorogeodin from sulochrin, was isolated from Penicillium frequentans CMI 96659. By chromatographies on DEAE-cellulose, hydroxyapatite, Phenyl-Sepharose, Mono P, Mono Q, and HPLC gel filtration columns, sulochrin oxidase was purified to apparent homogeneity. The purified enzyme had a molecular weight of 230 K as estimated by gel filtration and 110 K as estimated by sodium dodecylsulfate-polyacrylamide gel electrophoresis under denaturing conditions, suggesting that the active enzyme was a homodimer. The enzyme showed pI 4.0 and an optimum pH of 6. The enzyme activity was strongly inhibited by the copper-chelating reagent, diethyldithiocarbamate, and did not recover its full activity even after removing the inhibitor by dialysis. However, enzyme activity was fully restored by the addition of Cu2+. Thus, sulochrin oxidase is considered to be a copper protein. The enzyme showed high substrate specificity for benzophenone compounds such as sulochrin and dihydrogeodin.
Huang
K
K
Faculty of Pharmaceutical Sciences, University of Tokyo, Japan.
Yoshida
Y
Y
Mikawa
K
K
Fujii
I
I
Ebizuka
Y
Y
Sankawa
U
U
D000429:Alcohol Oxidoreductases / Q000032:analysis* / Q000037:antagonists & inhibitors / Q000302:isolation & purification; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D008970:Molecular Weight; D010407:Penicillium / Q000201:enzymology*; D013379:Substrate Specificity
D000429:Alcohol Oxidoreductases; C035077:sulochrin oxidase