Abstract
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 ± 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 ± 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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Acknowledgments
We thank Professor Byong Lee at Jiangnan University for his discussion and revision. This work was financially supported by the Key Program of National Natural Science Foundation of China (31130043), the National Natural Science Foundation of China (31200020, 31000054, 31171638), the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Jiangsu Planned Projects for Postdoctoral Research Funds (1101053C) and the Independent Innovation Program of Jiangnan University (JUSRP111A23).
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Zhang, C., Zhang, J., Kang, Z. et al. Enhanced production of l-phenylalanine in Corynebacterium glutamicum due to the introduction of Escherichia coli wild-type gene aroH . J Ind Microbiol Biotechnol 40, 643–651 (2013). https://doi.org/10.1007/s10295-013-1262-x
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DOI: https://doi.org/10.1007/s10295-013-1262-x