A novel laccase from white rot fungus Trametes orientalis:Purification,biochemical characterization,and application
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摘要
In this study,an extracellular laccase(Tolacc) from the culture filtrate of white rot fungus Trametes orientalis had been purified by a three-step method,i.e.ammonium sulfate fractional precipitation,DEAE-cellulose DE52 anionic exchange,and Sepharose CL-6B column chromatography.The sodium dodecyl sulphate poly-acrylamide gel electrophoresis(SDS-PAGE) exhibited a single protein band indicating that the enzyme preparation is a monomeric protein,and its molecular mass 44.0 k Da.When using 2,2'-azino-bis-(3-ethylbonzthiazoline-6-sulfonic acid)(ABTS) as the substrate,the Michaelis-Menten constant(Km),catalytic rate constant(kcat),and catalytic efficiency(kcat/Km) values of the laccase were 333.3 μM,21.81 s-1,and 7.0 s-l μM-1 respectively.Tolacc is highly stable and resistant under acidic conditions,with p H values ranging from 1.0 to 6.0.Remarkably,the temperature optima were 80 °C.Enzyme activity was enhanced in the presence of metal ions Cu2+,Mn2+,Mg2+,and Zn2+ at 25.0 m M.Various concentrations of inhibitors L-cysteine,dithiothreitol(DTT),and Na N3 had strong inhibitory effects on Tolacc activity,whereas no reduction occurred with metal ion chelator ethylene diamine tetraacetic acid(EDTA) under the same experimental conditions.These unusual properties demonstrated that the new fungal laccase Tolacc has potentials for the specific industrial or environmental applications.
In this study,an extracellular laccase(Tolacc) from the culture filtrate of white rot fungus Trametes orientalis had been purified by a three-step method,i.e.ammonium sulfate fractional precipitation,DEAE-cellulose DE52 anionic exchange,and Sepharose CL-6B column chromatography.The sodium dodecyl sulphate poly-acrylamide gel electrophoresis(SDS-PAGE) exhibited a single protein band indicating that the enzyme preparation is a monomeric protein,and its molecular mass 44.0 k Da.When using 2,2'-azino-bis-(3-ethylbonzthiazoline-6-sulfonic acid)(ABTS) as the substrate,the Michaelis-Menten constant(Km),catalytic rate constant(kcat),and catalytic efficiency(kcat/Km) values of the laccase were 333.3 μM,21.81 s-1,and 7.0 s-l μM-1 respectively.Tolacc is highly stable and resistant under acidic conditions,with p H values ranging from 1.0 to 6.0.Remarkably,the temperature optima were 80 °C.Enzyme activity was enhanced in the presence of metal ions Cu2+,Mn2+,Mg2+,and Zn2+ at 25.0 m M.Various concentrations of inhibitors L-cysteine,dithiothreitol(DTT),and Na N3 had strong inhibitory effects on Tolacc activity,whereas no reduction occurred with metal ion chelator ethylene diamine tetraacetic acid(EDTA) under the same experimental conditions.These unusual properties demonstrated that the new fungal laccase Tolacc has potentials for the specific industrial or environmental applications.
引文
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