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《中国化学工程学报(英文版)》 2012-04
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Engineering of Corynebacterium glutamicum to Enhance L-ornithine Production by Gene Knockout and Comparative Proteomic Analysis

LU Dongmei,LIU Jianzhong** and MAO Zongwan The Key Laboratory of Gene Engineering of Ministry of Education,State Key Laboratory of Biocontrol,Sun Yat-Sen University,Guangzhou 510275,China  
Engineered Corynebacterium glutamicum was constructed for L-ornithine production by disrupting genes of argF and proB to prevent the flux away from L-ornithine.Effect of the inactivation of 2-oxoglutarate de-hydrogenase complex(ODHC) on L-ornithine production was also investigated.It was found that the inactivation of ODHC by knockout of the kgd gene enhanced L-ornithine production.The engineered C.glutamicum ATCC13032(ΔargFΔproBΔkgd) produced L-ornithine up to 4.78 g·L-1 from 0.24 g·L-1 of the wild-type strain.In order to understand the mechanism of L-ornithine production in C.glutamicum ATCC13032(ΔargFΔproBΔkgd) and find out new strategies for further enhancing L-ornithine production,the comparative proteome between the wild-type and the engineered strain was analyzed.L-Ornithine overproduction in the engineered strain was related to the up-regulation of the expression levels of enzymes involved in L-ornithine biosynthesis pathway and down-regulation of the expression levels of proteins involved in pentose phosphate pathway.The overexpression of genes in the upstream pathway of glutamate to increase the availability of endogenous glutamate may further in-crease ornithine production in the engineered C.glutamicum and the ornithine synthesis enzymes(ArgCJBD) may not be the limiting enzymes in the engineered C.glutamicum.
【Fund】: Supported by the National Natural Science Foundation of China (30970089 20876181 20831006);; the Natural Science Foundation of Guangdong Province (9351027501000003)
【CateGory Index】: TQ922
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1 CAO Yan,Enock Mpofu,DING Jian,DUAN Zuoying,SHI Zhongping(Key Laboratory of Industrial Biotechnology,Ministry of Education,School of Biotechnology, Jiangnan University,Wuxi 214122,Jiangsu,China);Activities changes of key enzymes in glutamate fermentation in response of various initial biotin contents[J];CIESC Journal;2012-07
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