Abstract
The only family 1 glycoside hydrolase in Clostridium cellulolyticum H10 (CcGH1) is annotated as a beta-galactosidase but has high sequence homology with many beta-glucosidases. Given the possible importance of beta-glucosidase in cellulose utilization by C. cellulolyticum, the encoding open reading frame Ccel_0374 was cloned and expressed in E. coli as a soluble fusion protein with thioredoxin. After tag cleavage, the purified enzyme had a molecular mass of 52 kDa and was active in dimeric form on a broad range of substrates, including cellobiose, cellotriose, cellotetraose, p-nitrophenyl-beta-glucopyranoside, lactose, and o-nitrophenyl-beta-galactopyranoside. The enzyme showed lower K m and higher catalytic efficiency (k cat/K m) on cellodextrins with degree of polymerization from 2 to 4 than on lactose, and the k cat/K m values on cellodextrins increased in the order of cellobiose < cellotriose < cellotetraose, suggesting that CcGH1 was a cellodextrin glucohydrolase (EC 3.2.1.74). The high K m (69 mM) on cellobiose implies that CcGH1 likely has a minimal role in the intracellular hydrolysis of cellobiose in C. cellulolyticum. The three-dimensional structure model of CcGH1 generated by homology modeling showed a typical (α/β)8 barrel topology characteristic of family 1 glycoside hydrolases.
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This work was supported mainly by the DOE BioEnergy Science Center and partially by the USDA Bioprocessing and Biodesign Center as well as the DuPont Young Professor Award.
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Liu, W., Bevan, D.R. & Zhang, YH.P. The Family 1 Glycoside Hydrolase from Clostridium cellulolyticum H10 is a Cellodextrin Glucohydrolase. Appl Biochem Biotechnol 161, 264–273 (2010). https://doi.org/10.1007/s12010-009-8782-x
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DOI: https://doi.org/10.1007/s12010-009-8782-x