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A thermophilic glucoamylase fromCephalosporium eichhorniae
1Department of Microbiology, University of Guelph, N1G 2W1, Guelph, Ontario, Canada.
Abstract:
A novel exocellular glucoamylase produced by a thermophilic fungus,Cephalosporium eichhorniae, was purified by a combination of membrane filtration and Sephadex chromatography. The enzyme was a glycoprotein, 28% carbohydrate by weight. It was composed of a single polypeptide chain with a molecular weight of 26,850. The enzyme was thermostable with optimum activity between 45 and 62°C. It had a substrate preference of amylose>amylopectin. Analysis by thin-layer and gas-liquid chromatography showed the major hydrolytic product of starch was glucose, classifying this enzyme as a thermophilic glucoamylase.
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