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Metabolic engineering of a genetic selection system with tunable stringency.

Andreas C Kleeb1, Maryam Hansson Edalat, Marianne Gamper

  • 1Laboratory of Organic Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland.

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Researchers engineered a bacterial system to improve the production of phenylalanine by controlling metabolic flux. This method allows for the selection and evolution of enzymes, enhancing biocatalysis for small molecule biosynthesis.

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Area of Science:

  • Metabolic Engineering
  • Enzyme Evolution
  • Synthetic Biology

Background:

  • Metabolic flux engineering optimizes small molecule biosynthesis within cells.
  • Phenylalanine production relies on the conversion of prephenate to phenylpyruvate.

Purpose of the Study:

  • To develop an in vivo selection system for optimizing the prephenate to phenylpyruvate conversion.
  • To enhance the selection pressure for identifying effective replacements of the missing prephenate dehydratase enzyme.

Main Methods:

  • Engineered a bacterial host lacking prephenate dehydratase.
  • Utilized a regulable enzyme to divert prephenate down a parallel pathway, controlling its concentration.
  • Applied the system to differentiate dehydratases with a >50,000-fold activity range and isolate enzyme variants from large libraries.

Main Results:

  • Successfully established a system for fine-tuning metabolic flux in bacteria.
  • Demonstrated the ability to systematically increase selection pressure on enzyme replacements.
  • Isolated mechanistically informative prephenate dehydratase variants, showcasing the system's efficacy.

Conclusions:

  • The engineered selection strain is a powerful tool for characterizing and evolving enzymes.
  • This approach complements existing methods for adjusting selection pressure in biocatalysis.
  • The method is broadly applicable to selection systems based on endogenous metabolite conversion.