Purification and Characterization of a Cellulose-Binding (beta)-Glucosidase from Cellulose-Degrading Cultures of Phanerochaete chrysosporium.

Applied and Environmental Microbiology
E S LymarV Renganathan

Abstract

Extracellular (beta)-glucosidase from cellulose-degrading cultures of Phanerochaete chrysosporium was purified by DEAE-Sephadex chromatography, by Sephacryl S-200 chromatography, and by fast protein liquid chromatography (FPLC) using a Mono Q anion-exchange column. Sodium dodecyl sulfate-polyacrylamide gel electrophoretic (SDS-PAGE) analysis of FPLC-purified (beta)-glucosidase indicated the presence of three enzyme forms with molecular weights of 96,000, 98,000, and 114,000. On further fractionation with a microcrystalline cellulose column, the 114,000-molecular-weight (beta)-glucosidase, which had 82% of the (beta)-glucosidase activity, was bound to cellulose. The (beta)-glucosidases with molecular weights of 96,000 and 98,000 did not bind to cellulose. The cellulose-bound (beta)-glucosidase was eluted completely from the cellulose matrix with water. Cellulose-bound (beta)-glucosidase catalyzed p-nitrophenylglucoside hydrolysis, suggesting that the catalytic site is not involved in cellulose binding. When the cellulose-binding form was incubated with papain for 20 h, no decrease in the enzyme activity was observed; however, approximately 74% of the papain-treated glucosidase did not bind to microcrystalline cellulose. SDS-PAGE...Continue Reading

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