期刊
ENZYME AND MICROBIAL TECHNOLOGY
卷 48, 期 4-5, 页码 371-377出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2010.12.014
关键词
Cellulase; Minicellulosome; Corynebacterium glutamicum; Clostridium cellulovorans; Consolidated bioprocessing
资金
- Korean Government [2009-0073856]
- Korean government (MOST) [M102KK010014-08K1101-01421]
- National Research Foundation of Korea [2009-0073856] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Although cellulosic materials of plant origin are the most abundant utilizable biomass resource, the amino acid-producing organism Corynebacterium glutamicum can not utilize these materials. Here we report the engineering of a C. glutamicum strain expressing functional minicellulosomes containing chimeric endoglucanase E bound to miniCbpA from Clostridium cellulovorans that can hydrolyze cellulosic materials. The chimeric endoglucanase E consists of the endoglucanase E catalytic backbone of Clostridium thermocellum fused with the endoglucanase B dockerin domain of C. cellulovorans. The resulting strain degraded cellulose efficiently by substrate targeting via the carbohydrate binding module. The assembly of minicellulosomes increased the activity against carboxymethyl cellulose approximately 2.8-fold compared with that for the corresponding enzymes alone. This is the first report of the formation of Clostridium minicellulosomes by C. glutamicum. The development of C. glutamicum strain that is capable of more effective cellulose hydrolysis brings about a realization of consolidated bioprocessing for the utilization of cellulosic biomass. (C) 2011 Elsevier Inc. All rights reserved.
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