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Directed evolution of highly sensitive and stringent choline-induced gene expression controllers.

Yuki Yanai1, Takayuki Hoshino2, Yuki Kimura1

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Summary
This summary is machine-generated.

This study enhances a choline-controlled gene induction system for microbial production. The improved system achieves tight gene expression control with significantly lower inducer costs, making it ideal for industrial bioprocesses.

Keywords:
genetic circuitsinduction systemspositive looptranscription factor

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Biotechnology

Background:

  • Gene expression controllers are crucial for microbial production of proteins and chemicals.
  • Existing systems often lack low cost, safety, and tight control for industrial bioprocesses.
  • A previously developed choline-inducible system required high inducer concentrations (~100 mM).

Purpose of the Study:

  • To significantly improve the sensitivity of the choline-inducible gene expression system.
  • To reduce the cost of inducer molecules for industrial applications.
  • To achieve tighter and more efficient gene expression control.

Main Methods:

  • Engineered a positive-feedback loop (P-loop) using the choline importer protein BetT.
  • Tuned the translation level of BetT to optimize P-loop strength.
  • Deleted the endogenous betI gene to minimize noise and improve stringency.

Main Results:

  • Achieved highly active and stringent gene expression control with ~100 times less choline.
  • Demonstrated the lowest basal expression levels reported for choline-inducible systems.
  • Exhibited the lowest activation threshold and highest induction amplitude, comparable to strong promoters like PT5.

Conclusions:

  • The enhanced choline induction system offers cost-effective and precise control over gene expression.
  • This system overcomes previous limitations, enabling broader application in large-scale industrial bioprocesses.
  • Negligible inducer costs make this system a viable solution for industrial biotechnology.