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- W3206097411 abstract "Gamma-aminobutyric acid is an important nonprotein amino acid and has been extensively applied in pharmaceuticals, livestock, food additives, and so on. It is important to develop Corynebacterium glutamicum strains that can efficiently produce gamma-aminobutyric acid from glucose. In this study, production of gamma-aminobutyric acid in C. glutamicum CGY700 was improved by construction of CO2 anaplerotic reaction and overexpression of citrate synthase. The co-expression of ppc encoding phosphoenolpyruvate carboxylase and gltA encoding citrate synthase was constructed and optimized in the chromosome to compensate carbon loss and conquer metabolic bottleneck. The expression of ppc and gltA were controlled by promoters Ptac and PtacM, and the optimal mode of PtacM-ppc-Ptac-gltA was determined. Simultaneously, the genes pknG encoding serine/threonine protein kinase G and ldh encoding l-lactate dehydrogenase were deleted, and glnA2 encoding glutamine synthase was overexpressed in the chromosome. The final strain CGY-PG-304 constructed in this study could produce 41.17 g/L gamma-aminobutyric acid in shake flask cultivation and 58.33 g/L gamma-aminobutyric acid via Fed-Batch fermentation with a yield of 0.30 g/g glucose. CGY-PG-304 was constructed by genome editing; therefore, it is stable and not necessary to add any antibiotics and inducer during fermentation." @default.
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- W3206097411 date "2021-10-14" @default.
- W3206097411 modified "2023-10-16" @default.
- W3206097411 title "Improve gamma-aminobutyric acid production in Corynebacterium glutamicum by optimizing the metabolic flux" @default.
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