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Enzyme Microb Technol. 2011 Apr 7;48(4-5):371-7. doi: 10.1016/j.enzmictec.2010.12.014. Epub 2011 Jan 12.

Production of minicellulosomes for the enhanced hydrolysis of cellulosic substrates by recombinant Corynebacterium glutamicum.

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School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea.


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.

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