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Focused rational iterative site-specific mutagenesis (FRISM).

Danyang Li1, Qi Wu1, Manfred T Reetz2

  • 1Department of Chemistry, Zhejiang University, Hangzhou, PR China.

Methods in Enzymology
|September 8, 2020
PubMed
Summary
This summary is machine-generated.

Focused rational iterative site-specific mutagenesis (FRISM) offers a faster enzyme engineering approach. This method reduces screening efforts, enabling rapid identification of highly enantioselective and active enzyme mutants for synthetic chemistry and biotechnology.

Keywords:
Directed enzyme evolutionFocused rational iterative site-specific mutagenesisKinetic resolutionLipasesStereoselectivity

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Area of Science:

  • Enzyme engineering and protein design
  • Synthetic organic chemistry
  • Biotechnology

Background:

  • Directed evolution is a key enzyme engineering method, with stereoselectivity critical for applications.
  • Current methods like combinatorial active-site saturation test (CAST) and iterative saturation mutagenesis (ISM) reduce library size but still require extensive screening.
  • Traditional rational design has limited success in achieving high stereoselectivity.

Purpose of the Study:

  • To introduce and highlight a novel enzyme engineering methodology, focused rational iterative site-specific mutagenesis (FRISM).
  • To address the screening bottleneck in directed evolution for improving enzyme stereoselectivity.
  • To provide a more efficient alternative to existing protein engineering techniques.

Main Methods:

  • FRISM employs tools from traditional rational enzyme design.
  • The process is iterative, inspired by CAST and ISM methodologies.
  • Crucially, FRISM does not involve the creation of mutant libraries, significantly reducing the number of mutants to screen.

Main Results:

  • FRISM significantly reduces the screening effort compared to library-based methods.
  • The methodology enables the rapid identification of enzyme mutants.
  • Identified mutants exhibit high enantioselectivity and sufficient activity for practical applications.

Conclusions:

  • FRISM represents a breakthrough in enzyme engineering for stereoselectivity.
  • This iterative, non-library approach accelerates the discovery of superior enzyme variants.
  • FRISM is a promising technique for synthetic organic chemistry and biotechnology.