[Isolation and characterisation of chitosanase from Bacillus sp. 739 strain].
The specific nature of the chitosanase activity of the strain Bacillus sp. 739 has been determined. Maximum enzyme activity was observed in a medium containing the biomass of the fruiting bodies of the fungus Macrolepiota procera. The chitosanase was purified to homogeneity using chromatography on DEAE-Sephadex A-50 and Toyopearl HW-50. The molecular weight of the enzyme, assessed by electrophoresis (the Laemmli procedure) approximated 46 kDa. Temperature and pH optima of the purified chitosanase were in the ranges 45-55 degrees C and 6.0-6.5, respectively. Time to half-maximum inactivation of the enzyme at 50 degrees C was equal to 1 h. With colloidal chitosan as the substrate, the value of K(M) of the purified chitosanase was equal to 25 mg/ml. The enzyme also exhibited a weak ability to hydrolyze colloidal chitin.
Aktuganov
G E
GE
Institute of Biology, Ufa Research Center of the Russian Academy of Sciences, Ufa, 450054 Russia.
Shirokov
A V
AV
Melent'ev
A I
AI
D001407:Bacillus / Q000201:enzymology*; D001487:Basidiomycota / Q000254:growth & development; D002686:Chitin / Q000031:analogs & derivatives* / Q000378:metabolism; D048271:Chitosan; D002852:Chromatography, Ion Exchange; D017077:Culture Media, Conditioned; D004795:Enzyme Stability; D006026:Glycoside Hydrolases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism*; D006207:Half-Life; D006863:Hydrogen-Ion Concentration; D008970:Molecular Weight; D013379:Substrate Specificity; D013696:Temperature
D017077:Culture Media, Conditioned; D002686:Chitin; D048271:Chitosan; D006026:Glycoside Hydrolases; C019868:chitosanase