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Engineering an Overflow-Responsive Regulation System for Balancing Cellular Redox and Optimizing Microbial

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This study engineered an overflow biosensor to manage acetate byproduct in Escherichia coli. This improved metabolic control, boosting phloroglucinol production by over twofold.

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Area of Science:

  • Metabolic Engineering
  • Synthetic Biology
  • Biotechnology

Background:

  • Escherichia coli accumulates acetate during rapid aerobic growth on glucose, a phenomenon termed overflow metabolism.
  • Overflow metabolism negatively impacts cell growth, protein expression, and leads to carbon loss in bioproduction.
  • Acetate accumulation signifies metabolic burden and inefficient resource allocation in microbial systems.

Purpose of the Study:

  • To develop a biosensor for monitoring acetate concentration as an indicator of overflow metabolism.
  • To implement a dynamic regulation system to mitigate overflow metabolism and enhance phloroglucinol production.
  • To redirect carbon flux towards valuable product synthesis by controlling metabolic byproducts.

Main Methods:

  • Constructed an overflow biosensor to detect acetate concentration changes in real-time.
  • Integrated the biosensor with a bifunctional dynamic regulation system.
  • Applied the system to phloroglucinol biosynthesis in engineered Escherichia coli.

Main Results:

  • The biosensor effectively monitored acetate levels, signaling overflow metabolism.
  • The dynamic regulation system reduced cellular redox pressure and minimized carbon flux waste.
  • Phloroglucinol titer was significantly enhanced, reaching 1.30 g/L, a 2.04-fold increase.
  • Improved metabolic status and redirected carbon flux towards the target product.

Conclusions:

  • A novel byproduct-responsive biosensor system can improve cellular metabolic efficiency.
  • This approach offers a general strategy for enhancing bioproduction by managing overflow metabolism.
  • Real-time metabolic monitoring and regulation are key to optimizing microbial cell factories.