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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Utilization of low-stability variants in protein evolutionary engineering.

Mitsutoshi Wakisaka1, Shun-Ichi Tanaka1, Kazufumi Takano1

  • 1Department of Biomolecular Chemistry, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan.

International Journal of Biological Macromolecules
|June 7, 2024
PubMed
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Evolutionary engineering can be enhanced by including low-stability variants. Restabilizing these variants can lead to improved protein activity and diversified evolutionary pathways.

Keywords:
Evolutionary engineeringProtein activityProtein stability

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Area of Science:

  • Protein engineering
  • Biotechnology
  • Enzyme evolution

Background:

  • Evolutionary engineering is a key method for protein function modification.
  • Traditionally, low-stability variants are excluded, limiting evolutionary pathways.

Purpose of the Study:

  • To test a novel method incorporating low-stability variants into evolutionary engineering.
  • To diversify evolutionary pathways by including previously excluded variants.

Main Methods:

  • Utilized esterase from Alicyclobacillus acidocaldarius as a model protein.
  • Employed error-prone PCR for random mutations to improve enzyme activity.
  • Introduced a restabilization step using low-stability, low-temperature variants.

Main Results:

  • Identified several re-stabilizing variants after incorporating low-stability variants.
  • Some restabilized variants exhibited higher activity than the wild-type enzyme.
  • Demonstrated that low-stability variants can be re-evolved for enhanced function.

Conclusions:

  • Including low-stability variants in evolutionary engineering diversifies pathways.
  • Restabilization of low-stability variants can yield enzymes with superior activity.
  • This approach broadens the scope of evolutionary engineering for protein improvement.