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Articles

New strategy for removing acetic acid as a by-product during L-tryptophan production

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Pages 1471-1480 | Received 09 Jun 2019, Accepted 26 Sep 2019, Published online: 09 Oct 2019

Figures & data

Figure 1. Modified map of tryptophan metabolic network.

Figure 1. Modified map of tryptophan metabolic network.

Table 1. The strains and plasmids used in the experiment.

Table 2. Primers used in study.

Table 3. Apparent kinetic constants determined for the ACS of the different strains.

Figure 2. Growth curves of different strains.

Figure 2. Growth curves of different strains.

Figure 3. Relative transcriptional levels of GFP genes regulated by different promoters.

Figure 3. Relative transcriptional levels of GFP genes regulated by different promoters.

Figure 4. Relative transcriptional level of acs (A), pta and ackA (B), cell growth (C), tryptophan yield (D) and acetic acid (E) production after shake flask cultivations of the different E. coli strains.

Figure 4. Relative transcriptional level of acs (A), pta and ackA (B), cell growth (C), tryptophan yield (D) and acetic acid (E) production after shake flask cultivations of the different E. coli strains.

Table 4. Results of shake flask cultivations of the different E. coli strains.

Figure 5. Cell growth (A), tryptophan yield (B) and acetic acid production (C) of the engineered strains T03, T11 and T16 after fed-batch fermentation in a 5-L bioreactor. Note: Data are average values of at least 3 experiments.

Figure 5. Cell growth (A), tryptophan yield (B) and acetic acid production (C) of the engineered strains T03, T11 and T16 after fed-batch fermentation in a 5-L bioreactor. Note: Data are average values of at least 3 experiments.