title: Production of minicellulosomes for the enhanced hydrolysis of cellulosic substrates by recombinant Corynebacterium glutamicum.
abstract: 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.
authors: School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea.
authors: Jeong Eun
authors: JE
authors: Hyeon
authors: Woo Jung
authors: WJ
authors: Jeon
authors: Sun Young
authors: SY
authors: Whang
authors: Sung Ok
authors: SO
authors: Han
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001709:Biotechnology / Q000379:methods*; D002266:Carboxymethylcellulose Sodium / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D002480:Cellulase / Q000235:genetics / Q000378:metabolism; D002482:Cellulose / Q000378:metabolism; D044603:Cellulosomes / Q000378:metabolism*; D046974:Clostridium cellulovorans / Q000201:enzymology / Q000235:genetics; D048230:Corynebacterium glutamicum / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D003470:Culture Media; D005818:Genetic Engineering / Q000379:methods; D006868:Hydrolysis; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D003470:Culture Media; D011994:Recombinant Proteins; C074074:cellulose binding protein A, Clostridium cellulovorans; D002482:Cellulose; D002480:Cellulase; D002266:Carboxymethylcellulose Sodium