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- W2890736863 abstract "4-Hydroxyisoleucine (4-HIL) exhibits a unique glucose-dependent insulinotropic activity and is a promising candidate for the treatment of diabetes. Direct fermentation of 4-HIL has been recently studied; however, the expected titre and yield were not achieved. In this study, we initially developed a pathway for the synthesis of 4-HIL in an L-isoleucine producer, C. glutamicum YI, but insufficient supply of α-ketoglutarate was a bottleneck for a strong production. Six genes involved in oxaloacetate and α-ketoglutarate branches were overexpressed or deleted, which increased the production of 4-HIL to 5.12 g/L but a considerable amount of L-isoleucine still accumulated in the culture. We then dynamically modulated the activity of the α-ketoglutarate dehydrogenase complex (ODHC) by employing L-isoleucine-responsive transcription or attenuation strategies. The best-engineered strain, HIL18, produced 34.21 g/L 4-HIL with a negligible accumulation of byproducts, including approximately 0.6 g/L L-isoleucine. This study achieved the highest production and yield of 4-HIL, and optimizing the TCA cycle by dynamically modulating the activity of ODHA can be a powerful strategy to balance the carbon flux and achieve efficient production of α-ketoglutarate and derivatives." @default.
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- W2890736863 date "2018-09-01" @default.
- W2890736863 modified "2023-10-18" @default.
- W2890736863 title "High production of 4-hydroxyisoleucine in Corynebacterium glutamicum by multistep metabolic engineering" @default.
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- W2890736863 doi "https://doi.org/10.1016/j.ymben.2018.09.008" @default.
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