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Updated: Jul 5, 2025
10:50
Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening
Published on: April 1, 2016
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Two-substrate enzyme engineering using small libraries that combine the substrate preferences from two different
Arka Mukhopadhyay1, Kersti Karu2, Paul A Dalby3
1Department of Biochemical Engineering, UCL, Bernard Katz Building, Gower Street, London, WC1E 6BT, UK.
Scientific Reports
|January 13, 2024
Summary
Enzyme engineering advances biocatalysis by enabling new substrate combinations. Researchers successfully combined mutations to create novel enzyme variants with significantly improved activity for specific two-substrate reactions.
Area of Science:
- Biocatalysis and enzyme engineering
- Synthetic biology
- Protein engineering
Background:
- Enzyme industrialisation requires broader substrate scope and high catalytic activity.
- Engineering enzymes for novel two-substrate reactions is complex due to interconnected active site roles.
Purpose of the Study:
- To develop a method for combining beneficial mutations to reprogram enzyme active sites for new two-substrate reactions.
- To enhance the catalytic activity of enzymes towards alternative substrates.
Main Methods:
- Designed small mutant libraries incorporating natural and non-natural amino acids at key mutational sites.
- Investigated enzyme variants for improved catalysis of the reaction between 3-formylbenzoic acid (3-FBA) and pyruvate.
- Utilized computational docking to analyze active site structural changes and substrate-enzyme interactions.
Main Results:
- Achieved up to a 630-fold increase in catalytic rate (kcat) for the 3-FBA and pyruvate reaction.
- Identified specific mutations that enhance the proximity of 3-FBA to the enamine-Thiamine pyrophosphate (TPP) intermediate.
- Demonstrated successful reprogramming of enzyme active sites for specific two-substrate conversions.
Conclusions:
- Small libraries enable rapid, plug-and-play reprogramming of enzyme active sites.
- This approach facilitates the creation of novel biocatalysts for diverse two-substrate reactions.
- Advances enzyme engineering for industrial applications by expanding substrate acceptance and catalytic efficiency.
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