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Switch on a more efficient pyruvate synthesis pathway based on transcriptome analysis and metabolic evolution.

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Summary

Gluconate metabolism via the Entner-Doudoroff (ED) pathway enhances pyruvate production in engineered Escherichia coli. This study engineered a strain for efficient pyruvate generation using the ED pathway, achieving high yields.

Keywords:
Entner–Doudoroff pathwayMetabolic evolutionPyruvateRedox stateTranscriptome

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Area of Science:

  • Microbial Engineering
  • Metabolic Engineering
  • Synthetic Biology

Background:

  • Gluconate metabolism offers advantages over glucose for pyruvate production due to higher intracellular NADH availability.
  • The Entner-Doudoroff (ED) pathway is a key glycolytic route that can be leveraged for enhanced metabolite synthesis.

Purpose of the Study:

  • To engineer a novel pyruvate-producing Escherichia coli strain utilizing the Entner-Doudoroff (ED) pathway with glucose as a substrate.
  • To optimize pyruvate yield and concentration by manipulating central carbon metabolism and selecting for ED pathway dominance.

Main Methods:

  • Genetic engineering of Escherichia coli by sequential deletion of genes involved in competing metabolic pathways (e.g., PEP-consuming enzymes, EMP, and PPP).
  • Directed evolution through prolonged cultivation (approx. 1000 generations) to select for strains with an activated ED pathway.
  • Metabolic flux analysis and fermentation studies to evaluate pyruvate production performance.

Main Results:

  • An engineered strain (YP404) was developed where the ED pathway became the primary glycolytic route.
  • Pyruvate concentration and yield were significantly improved by 59% and 10.1% respectively, compared to the parent strain (YP211).
  • Fed-batch fermentation achieved a high pyruvate concentration of 83.5 g/L with a volumetric productivity of 2.3 g/L/h.

Conclusions:

  • The Entner-Doudoroff (ED) pathway is a viable and effective route for microbial pyruvate production from glucose.
  • Metabolic engineering combined with adaptive laboratory evolution can successfully redirect carbon flux towards pyruvate synthesis via the ED pathway.
  • This work presents a novel strategy for efficient pyruvate biosynthesis, offering potential for industrial applications.