Construction of a recombinant Escherichia coli JM109/A-68 for production of carboxymethylcellulase and comparison of its production with its wild type, Bacillus velezensis A-68 in a pilot-scale bioreactor
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- 作者：Myung-Hwan Kim ; Duk-Un Kang ; Jin-Woo Lee
- 关键词：Bacillus velezensis ; carboxymethylcellulase ; cloning ; expression ; Escherichia coli JMB109 ; rice bran
- 刊名：Biotechnology and Bioprocess Engineering
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：21
- 期：5
- 页码：601-611
- 全文大小：917 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Biotechnology - 出版者：The Korean Society for Biotechnology and Bioengineering
- ISSN：1976-3816
- 卷排序：21
文摘
A gene encoding carboxymethylcellulase (CMCase) of Bacillus velezensis A-68 had been cloned in Escherichia coli JM109. Based on productivity and economic aspect, rice bran and ammonium chloride were chosen to be optimal carbon and nitrogen sources for production of CMCase by E. coli JM109/A-68. The optimal conditions for rice bran, ammonium chloride, and initial pH of medium for production of CMCase were established by the response surface methodology (RSM). The concentrations of four salts in the medium, K2HPO4, NaCl, MgSO4·7H2O, and (NH4)2SO4, for production of CMCase also were optimized. The optimal temperatures for cell growth and production of CMCase were 37°C. The maximal production of CMCase by E. coli JM109/A-68 was 880.2 U/mL, which was 10.5 time higher than its wild type, B. velezensis A-68. The production of CMCase by E. coli JM109/A-68 was compared with that by B. velezensis A-68 in a 100 L pilot-scale bioreactor under the optimized conditions. The production of CMCase by E. coli JM109/A-68 was found to be the mixed-growth associated unlike the growthassociated production of CMCase by B. velezensis A-68.