Abstract
A β-xylosidase of a thermophilic fungus, Malbranchea pulchella var. sulfurea No. 48, was purified 99-fold from the culture filtrate after ammonium sulfate fractionation, DEAE-cellulose column chromatography, column electrophoresis and gel filtration on Sephadex G–200. The purified enzyme was found to be homogeneous upon ultracentrifugal analysis, disc electrophoresis and gel filtration. The molecular weight of the enzyme was estimated to be 26,000 by gel filtration, and the sedimentation coefficient was calculated to be 2.78S. at 280 nm in phosphate buffer (pH 6.7) was 13.2. The optimum pH was found to be in the range of 6.2~6.8, and the optimum temperature was 50°C.
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