Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Purification and Characterization of an Exo-polygalacturonase from Botrytis cinerea

  • Published : 1997.06.01
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Abstract

Botrytis cinerea T91-1 has been shown to produce at least four different polygalacturonases into a liquid medium containing citrus pectin, a carbon sousrce. One of the enzymes, which had an apparent molecular weight of 66 kDa estimated by denatured polyacrylamide gel electrophoresis, was purified to electrophoretic homogeneity by a series of procedures including a cetone precipitation, ion exchange, heparin affinity, and reverse phase column chromatographies. The molecular weight of native enzyme was determined to be 64 kDa by gel permeation chromatography indicating the enzyme to be a single polypeptide chain. By viscometric analysis, the enzyme was revealed as exo-polygalacturonase. The enzyme activity was inhibited by divalent cations such as $Ca^{2+}$, $Mg^{2+}$, and Cu$^{2+}$. Km and Vmax for polygalacturonic acid hydrolysis were 0.33 mg/ml and 28.6 nM/min, respectively. The optimum temperature for enzymatic activity was 5$0^{\circ}C$. And the enzyme showed optimal pH values between 4.0 and 5.0. The enzyme was stable upto 12 hours in the range of pH 3 to 8 and at temperature below 3$0^{\circ}C$.

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