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Updated: Mar 15, 2026
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Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening
Published on: April 1, 2016
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A fluorogenic screening platform enables directed evolution of an alkyne biosynthetic tool
Xuejun Zhu1, Peyton Shieh, Michael Su
1Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94704, USA.
Chemical Communications (Cambridge, England)
|August 26, 2016
Summary
Directed evolution enhanced the bifunctional desaturase/acetylenase JamB enzyme. A new platform measuring alkyne-tagged metabolites revealed a variant with 20-fold higher activity in E. coli.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzyme Engineering
Background:
- JamB is a membrane-bound enzyme with desaturase and acetylenase functions.
- Improving enzyme activity is crucial for biotechnological applications.
- Efficient screening methods are needed for protein engineering.
Purpose of the Study:
- To improve the catalytic activity of the JamB enzyme through directed evolution.
- To develop a rapid assay for quantifying alkyne-tagged metabolites to assess enzyme engineering outcomes.
Main Methods:
- Directed evolution involving random mutagenesis of the JamB gene.
- Development of a fluorogenic click reaction assay for extracellular alkyne-tagged metabolite quantification.
- Expression and characterization of JamB variants in E. coli.
Main Results:
- Identified a JamB variant with approximately 20-fold increased activity compared to the wild-type.
- The developed assay enabled rapid and sensitive assessment of enzyme activity.
- Demonstrated the utility of directed evolution for enhancing bifunctional enzyme performance.
Conclusions:
- Directed evolution is an effective strategy for improving JamB enzyme activity.
- The novel fluorogenic click reaction platform facilitates high-throughput screening in enzyme engineering.
- Enhanced JamB variants hold potential for metabolic engineering and synthetic biology applications.
