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Published on: July 14, 2015
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.
Evolutionary engineering can be enhanced by including low-stability variants. Restabilizing these variants can lead to improved protein activity and diversified evolutionary pathways.
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.
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