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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Liu, Wenjin Bevan, David R. Zhang, Y-H Percival |
| Description | Country affiliation: United States Author Affiliation: Liu W ( Department of Biological Systems Engineering, Virginia Polytechnic Institute and State University, 210-A Seitz Hall, Blacksburg, VA 24061, USA.) |
| 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 (alpha/beta)(8) barrel topology characteristic of family 1 glycoside hydrolases. |
| File Format | HTM / HTML |
| ISSN | 02732289 |
| Issue Number | 1-8 |
| Volume Number | 161 |
| e-ISSN | 15590291 |
| Journal | Applied Biochemistry and Biotechnology |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2010-05-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry Discipline Biotechnology Bacterial Proteins Metabolism Cellulose Analogs & Derivatives Clostridium Cellulolyticum Enzymology Dextrins Glycoside Hydrolases Chemistry Genetics Models, Molecular Molecular Sequence Data Open Reading Frames Protein Structure, Tertiary Recombinant Fusion Proteins Substrate Specificity Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s. |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Molecular Biology Environmental Engineering Biochemistry Bioengineering Applied Microbiology and Biotechnology Biotechnology |
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