Escherichia coli TS-8
A feedback-insensitive variant of thrA alleviates the serine-induced inhibition of threonine biosynthesis, thereby restoring cellular growth and tryptophan production.
Strain derived from a randomly mutated strain.
Ancestors
Derived strains
Genotype with respect to parental
thrAmut
Genotype with respect to wild type
F+ (λ) | λ- | inv(rrnD-rrnE) | F-, λ-, rph-1, IN (rrnD, rrnE) | Plasmid PH5a1 added | ΔglnA::BSglnA | ΔackA::J23119-icd ΔpoxB::J23119-gdhA | ΔatpI::Ptrc::prs | serAmut | thrAmutBars (|) indicate differences between strains.
Plasmids
-
PH5a1 (aroGfbr trpEDCBA)
Modifications
| Origin | Gene | Organism | Modification |
|---|---|---|---|
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Silencing
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Overexpression
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Overexpression
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Overexpression
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Silencing
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Silencing
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Silencing
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Overexpression
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Feedback insensitive
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Feedback insensitive
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Feedback insensitive
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Overexpression
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Overexpression
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Overexpression
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Overexpression
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Overexpression
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Production
| Metabolites | Production type | Production | Biomass | Carbon source | Time | Scale | Ref. |
|---|---|---|---|---|---|---|---|
| L-tryptophan | Titer | 1.38 g/L | 48 h | Flask | [136] | ||
| L-tryptophan | Substrate yield | 5.4 % | 48 h | Flask | [136] | ||
| L-serine | Titer | 0.05 g/L | 48 h | Flask | [136] | ||
| 2-oxoglutarate | Titer | 1.09 g/L | 48 h | Flask | [136] | ||
| acetate | Titer | 0.138 g/L | 48 h | Flask | [136] |
* Inferred from plots using RetroPlot.
Heterologous.
Target metabolites are shown in bold, while non-bold metabolites represent intermediates or potential byproducts.