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Improvement in enzymatic desizing of starched cotton cloth using yeast codisplaying glucoamylase and cellulose-binding domain
Authors:Takeshi Fukuda  Michiko Kato-Murai  Kouichi Kuroda  Mitsuyoshi Ueda  Shin-ichiro Suye
Institution:(1) Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, University of Fukui, 3-9-1, Bunkyo, Fukui 910-8507, Japan;(2) Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
Abstract:To utilize glucoamylase-displaying yeast cells for enzymatic desizing of starched cotton cloth, we constructed yeast strains that codisplayed Rhizopus oryzae glucoamylase and two kinds of Trichoderma reesei cellulose-binding domains (CBD1, CBD of cellobiohydrolase I (CBHI); and CBD2, CBD of cellobiohydrolase II (CBHII)). In this study, we aimed to obtain a high efficiency of enzymatic desizing of starched cotton cloth. Yeast cells that codisplayed glucoamylase and CBD had higher activity on starched cotton cloth than yeast cells that displayed only glucoamylase. Glucoamylase and double CBDs (CBD1 and CBD2) codisplaying yeast cells exhibited the highest activity ratio (4.36-fold), and glucoamylase and single CBD (CBD1 or CBD2) codisplaying yeast cells had higher relative activity ratios (2.78- and 2.99-fold, respectively) than glucoamylase single-displaying cells. These results indicate that the glucoamylase activity of glucoamylase-displaying cells would be affected by the binding ability of CBD codisplayed on the cell surface to starched cotton cloth. These novel strains might play useful roles in the enzymatic desizing of starched cotton cloth in the textile industry.
Keywords:Yeast cell surface engineering            Rhizopus oryzae glucoamylase            Trichoderma reesei cellulose-binding domain  Enzymatic desizing
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