Title |
NaCl-, protease-tolerant and cold-active endoglucanase from Paenibacillus sp. YD236 isolated from the feces of Bos frontalis
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Published in |
SpringerPlus, June 2016
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DOI | 10.1186/s40064-016-2360-9 |
Pubmed ID | |
Authors |
Mingjie Dong, Yunjuan Yang, Xianghua Tang, Jidong Shen, Bo Xu, Junjun Li, Qian Wu, Junpei Zhou, Junmei Ding, Nanyu Han, Yuelin Mu, Zunxi Huang |
Abstract |
Bos frontalis, which consumes bamboo and weeds, may have evolved unique gastrointestinal microorganisms that digest cellulase. A Paenibacillus sp. YD236 strain was isolated from B. frontalis feces, from which a GH8 endoglucanase gene, pglue8 (1107 bp, 54.5 % GC content), encoding a 368-residue polypeptide (PgluE8, 40.4 kDa) was cloned. PgluE8 efficiently hydrolyzed barley-β-d-glucan followed by CMC-Na, soluble starch, laminarin, and glucan from black yeast optimally at pH 5.5 and 50 °C, and retained 78.6, 41.6, and 34.5 % maximum activity when assayed at 20, 10, and 0 °C, respectively. Enzyme activity remained above 176.6 % after treatment with 10.0 mM β-mercaptoethanol, and was 83.0, 78, and 56 % after pre-incubation in 30 % (w/v) NaCl, 16.67 mg/mL trypsin, and 160.0 mg/mL protease K, respectively. Cys23 and Cys364 residues were critical for PgluE8 activity. pglue8, identified from B. frontalis feces for the first time in this study, is a potential alternative for applications including food processing, washing, and animal feed preparation. |
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Researcher | 2 | 12% |
Student > Ph. D. Student | 2 | 12% |
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Student > Bachelor | 1 | 6% |
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Immunology and Microbiology | 1 | 6% |
Other | 1 | 6% |
Unknown | 4 | 24% |