Abstract
beta-Glucosidase activity in crude extracts of Mucor racemosus exists in a soluble form and in a wall-bound form which sediments at 3,500 x g. The soluble form and a wall-bound form were purified to homogeneity by ammonium sulfate fractionation. DEAE-Sephadex chromatography, and SP-Sephadex chromatography. Both forms were identical in all parameters measured. Each enzyme is a glycoprotein of 91,000 daltons, with an identical amino acid composition and N-terminal amino acid of lysine; both contain about 10% carbohydrate. Both forms catalyze the hydrolysis of cellobiose and p-nitrophenyl-beta-D-glucoside with identical kinetic constants.
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