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Engineering dynamic pathway regulation using stress-response promoters.

Robert H Dahl1, Fuzhong Zhang, Jorge Alonso-Gutierrez

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Metabolic engineering can be improved by dynamically controlling toxic intermediates using novel sensor-regulator systems. This approach enhances product yield and cell growth without expensive inducers.

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Area of Science:

  • Metabolic Engineering
  • Synthetic Biology
  • Biotechnology

Background:

  • Heterologous metabolic pathways can produce toxic intermediates, hindering cellular function and product yield.
  • Dynamic control of pathway enzymes is needed to prevent toxic metabolite accumulation, but requires specific sensors.
  • Currently, sensors for detecting and responding to toxic metabolic intermediates are largely unknown.

Purpose of the Study:

  • To identify novel promoter-based sensors that respond to toxic intermediate accumulation.
  • To utilize these sensors for dynamic pathway regulation and enhance production of desired compounds.
  • To improve the overall efficiency and yield in metabolic engineering applications.

Main Methods:

  • Whole-genome transcript arrays were used to identify promoters responsive to toxic intermediate accumulation.
  • Identified promoters were employed to dynamically control pathway enzyme activity.
  • The strategy was applied to regulate farnesyl pyrophosphate (FPP) production in Escherichia coli.

Main Results:

  • The dynamic regulation strategy improved amorphadiene production by twofold compared to constitutive or inducible promoters.
  • This method eliminated the need for costly chemical inducers.
  • Reduced acetate accumulation and improved host cell growth were observed.

Conclusions:

  • Novel sensor-regulator systems can be identified using transcriptomics for dynamic metabolic pathway control.
  • This approach offers a cost-effective and efficient method for enhancing product titers in metabolic engineering.
  • The strategy demonstrates broad utility for regulating toxic intermediates in biosynthetic pathways.