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Versatile selective evolutionary pressure using synthetic defect in universal metabolism.

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Enzyme engineering is advanced by a novel artificial selection method using cofactor regeneration. This approach enables rapid isolation of improved enzymes for industrial applications by linking enzyme function to cell growth.

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Area of Science:

  • Biotechnology
  • Enzyme Engineering
  • Synthetic Biology

Background:

  • Industrial applications demand novel enzymes, but de novo design is challenging.
  • Semi-rational enzyme evolution requires effective selection methods, which are often limited in scope.
  • Linking enzyme function to cell growth offers a powerful selection strategy.

Purpose of the Study:

  • To develop a broadly applicable artificial selection method for enzyme engineering.
  • To demonstrate the utility of cofactor-dependent enzyme substitution for selection.
  • To rapidly isolate enzyme variants with desired industrial properties.

Main Methods:

  • Inactivated essential NAD regeneration genes in E. coli, creating a conditional growth defect.
  • Utilized diverse enzymes (alcohol dehydrogenase, imine reductase, nitroreductase) dependent on nicotinamide adenine dinucleotide (NAD) or nicotinamide adenine dinucleotide phosphate (NADP) for cell rescue.
  • Screened large variant libraries for improved enzyme function linked to growth.

Main Results:

  • Demonstrated that foreign enzymes can substitute for defective NAD regeneration if supplied with substrates.
  • Successfully isolated alcohol dehydrogenase, imine reductase, and nitroreductase variants with enhanced selectivity.
  • Developed a high-performing isopropanol metabolic pathway through directed evolution.

Conclusions:

  • The developed method provides a versatile platform for artificial selection in enzyme engineering.
  • This approach accelerates the discovery of enzymes tailored for specific industrial needs.
  • Cofactor-dependent enzyme substitution is a powerful strategy for linking enzyme activity to cellular fitness.