期刊
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
卷 40, 期 6, 页码 643-651出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10295-013-1262-x
关键词
L-phenylalanine; Corynebacterium glutamicum; aroH; Metabolic engineering
资金
- Key Program of National Natural Science Foundation of China [31130043]
- National Natural Science Foundation of China [31200020, 31000054, 31171638]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Planned Projects for Postdoctoral Research Funds [1101053C]
- Independent Innovation Program of Jiangnan University [JUSRP111A23]
Metabolic engineering is a powerful tool which has been widely used for producing valuable products. For improving l-phenylalanine (l-Phe) accumulation in Corynebacterium glutamicum, we have investigated the target genes involved in the biosynthetic pathways. The genes involved in the biosynthesis of l-Phe were found to be strictly regulated genes by feedback inhibition. As a result, overexpression of the native wild-type genes aroF, aroG or pheA resulted in a slight increase of l-Phe. In contrast, overexpression of aroF (wt) or pheA (fbr) from E. coli significantly increased l-Phe production. Co-overexpression of aroF (wt) and pheA (fbr) improved the titer of l-Phe to 4.46 +/- A 0.06 g l(-1). To further analyze the target enzymes in the aromatic amino acid synthesis pathway between C. glutamicum and E. coli, the wild-type gene aroH from E. coli was overexpressed and evaluated in C. glutamicum. As predicted, upregulation of the wild-type gene aroH resulted in a remarkable increase of l-Phe production. Co-overexpression of the mutated pheA (fbr) and the wild-type gene aroH resulted in the production of l-Phe up to 4.64 +/- A 0.09 g l(-1). Based on these results we conclude that the wild-type gene aroH from E. coli is an appropriate target gene for pathway engineering in C. glutamicum for the production of aromatic amino acids.
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