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• W4285193406 abstract "In this study, phosphoenolpyruvate and erythrose-4-phosphate are efficiently supplied by collaborative design of Embden-Meyerhof-Parnas (EMP) pathway and pentose phosphate (PP) pathway in Escherichia coli, thus increasing the L-tryptophan production. Firstly, the effects of disrupting EMP pathway on L-tryptophan production were studied, and the results indicated that the strain with deletion of phosphofructokinase A (i.e., E. coli JW-5 ΔpfkA) produced 23.4 ± 2.1 g/L of L-tryptophan production. However, deletion of phosphofructokinase A and glucosephosphate isomerase is not conducive to glucose consumption and cell growth, especially deletion of glucosephosphate isomerase. Next, the carbon flux in PP pathway was enhanced by introduction of the desensitized glucose-6-phosphate dehydrogenase (zwf) and 6-phosphogluconate dehydrogenase (gnd) and thus increasing the L-tryptophan production (i.e., 26.5 ± 3.2 g/L vs. 21.7 ± 1.3 g/L) without obviously changing the cell growth (i.e., 0.41 h−1 vs. 0.44 h−1) as compared with the original strain JW-5. Finally, the effects of co-modifying EMP pathway and PP pathway on L-tryptophan production were investigated. It was found that the strain with deletion of phosphofructokinase A as well as introduction of the desensitized zwf and gnd (i.e., E. coli JW-5 zwf243 gnd361 ΔpfkA) produced 31.9 ± 2.7 g/L of L-tryptophan, which was 47.0% higher than that of strain JW-5. In addition, the glucose consumption rate of strain JW-5 zwf243 gnd361 ΔpfkA was obviously increased despite of the bad cell growth as compared with strain JW-5. The results of this study have important reference value for the following application of metabolic engineering to improve aromatic amino acids producing strains." @default.
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• W4285193406 date "2022-01-01" @default.
• W4285193406 modified "2023-10-18" @default.
• W4285193406 title "Co-ordinated combination of Embden-Meyerhof-Parnas pathway and pentose phosphate pathway in Escherichia coli to promote L-tryptophan production" @default.
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• W4285193406 doi "https://doi.org/10.32604/biocell.2022.020899" @default.
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