title: [Purification and properties of manganese peroxidase from Trametes versicolor].
abstract: Two manganese peroxidase (MnP) active fractions D1 and D2 were got from the extracellular culture of Trametes versicolor by using ammonium sulfate precipitation, DEAE-cellulose DE52 chromatography. MnP1 was purified to electrophoretic homogeneity from the D2 by Phenyl Sepharose 6 Fast Flow chromatography and MnP2 was purified to electrophoretic homogeneity from the D1 by Sephacryl S-200HR chromatography and Phenyl Sepharose 6 Fast Flow chromatography. The specific activities of two MnP isozymes are 579.1U/mg and 425.0U/mg; purification folds are 17.51 and 12.85 and the yields are 6.17% and 2.47%, respectively. MnP1 and MnP2 have approximate molecular masses of 46.3kD and 43.0kD respectively, as determined by SDS-PAGE. The isoenzymes differed in optimum temperature (60degreesC and 65degreesC) and optimum pH(5.8 and 6.2) for oxidation of DMP (2,6-dimethoxyphenol). MnP1 and MnP2 are stable below 45degreesC and ranging from pH4.0 to pH7.0. DMP is the best substrate, the Km values of MnP1 and MnP2 for DMP are 13.43micromol/L and 12.45micromol/L respectively. Catalysis doesn't occur in the complete absence of Mn. EDTA inhibites the activities of MnP1 and MnP2 at the higher concentration and DTT inhibites the enzyme activities completely.
authors.affiliation: Institute of Microbiology, Chinese Academy of Sciences, Beijing.
authors.forename: Lian-hui
authors.initials: LH
authors.lastname: Zhang
authors.forename: Xiu-qing
authors.initials: XQ
authors.lastname: Yang
authors.forename: Ke-shan
authors.initials: KS
authors.lastname: Ge
authors.forename: Shi-jun
authors.initials: SJ
authors.lastname: Qian
mesh_terms: D006863:Hydrogen-Ion Concentration; D010544:Peroxidases / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D055454:Trametes / Q000201:enzymology*
chemical_list: D010544:Peroxidases; C051129:manganese peroxidase