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DiRect: Site-directed mutagenesis method for protein engineering by rational design.

Satoru Watanabe1, Masahiro Ito1, Takanori Kigawa1

  • 1Laboratory for Cellular Structural Biology, RIKEN Center for Biosystems Dynamics Research (BDR), 1-7-22 Suehiro-cho, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan; Laboratory for Biomolecular Structure and Dynamics, RIKEN Quantitative Biology Center (QBiC), 1-7-22 Suehiro-cho, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan.

Biochemical and Biophysical Research Communications
|March 16, 2021
PubMed
Summary

A new PCR-based method, DiRect, simplifies site-directed mutagenesis for protein engineering. This efficient technique accelerates the discovery of novel enzyme variants, like a more thermostable reductase.

Keywords:
Cell-free systemPCRProtein engineeringSite-directed mutagenesisThermostability

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Area of Science:

  • Molecular Biology
  • Protein Engineering
  • Biotechnology

Background:

  • Site-directed mutagenesis (SDM) is crucial for molecular biology and protein engineering but is often time-consuming and relies on recombinant DNA technology.
  • Rational design of enzymes requires efficient SDM and protein expression, which are current bottlenecks in the field.

Purpose of the Study:

  • To develop a novel, high-performance PCR-based mutagenesis method (DiRect) that bypasses the need for recombinant DNA technology.
  • To evaluate the efficiency and scalability of DiRect in enzyme engineering using a cell-free protein expression system.

Main Methods:

  • Developed DiRect, a PCR-based mutagenesis technique.
  • Applied DiRect in conjunction with a cell-free protein expression system.
  • Engineered nicotinamide adenine dinucleotide phosphate-dependent 3-quinuclidinone reductase from Rhodotorula rubra.

Main Results:

  • DiRect achieved high product quality (≥99% substitution) without recombinant DNA.
  • 90 designed mutant proteins were produced within two days using DiRect and cell-free expression.
  • An unreported mutant (Q135I) with significantly enhanced thermostability was identified.

Conclusions:

  • DiRect is a simple, efficient, and potentially scalable method for site-directed mutagenesis.
  • The DiRect method accelerates the engineering of enzymes with improved properties, such as enhanced thermostability.