Pham Thu Huong, Le Thi Thuy, Dinh Nho Thai, Nguyen Thi Hong Loan

Main Article Content

Abstract

Catalase is an enzyme present in peroxisome in most aerobic cells and is a central component of detoxifying processes that rapidly suppress the formation of H2O2 by catalysing the degradation of H2O2 into H2O and O2. In this study, catalase was purified from Bacillus subtilis PY79 by three steps: ammonium sunfate precipitation, anion exchange chromatography on Q-sepharose and cation exchange chromatography on CM-sepharose. The purified catalase showed high specific activity of 30717,2 U/mg with 8,89% yield. The enzyme remained active over a broad pH range of 5 – 11, with a peak in activity at pH 7,0. A broad optimum temperature range from 4 – 40oC was observed with highest activity at 37oC. The apparent Km for H2O2 was 14,4 mM and its Vmax was 16294,83 U/mg. Moreover, it was inhibited by NaN3, FeCl3, FeSO4, NaCl at concentrations of 5 μM, 15 mM, 50 mM, 2 M, respectively and MgSO4 or MnSO4 at 1 M was no inhibitory effect on this enzyme

Keywords: Bacillus subtilis PY79, catalase, characterization, purification

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