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Published on: November 12, 2012
Multidimensionally engineered Escherichia coli for efficient gadusol biosynthesis with high-throughput quantitative
Ping Zhang1, Weijiao Zhang1, Haibo Xiong1
1Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; Science Center for Future Foods, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
Researchers engineered *Escherichia coli* for efficient biosynthesis of the sunscreen compound gadusol. This microbial production strategy achieved a final titer of 4.2 g/l, overcoming previous availability limitations.
Area of Science:
- Biotechnology
- Synthetic Biology
- Metabolic Engineering
Background:
- Gadusol, a cyclohexenone, possesses valuable sunscreen and antioxidant properties.
- Limited availability of gadusol, particularly from microbial sources, restricts its widespread application.
- Microbial cell factories offer a promising avenue for sustainable gadusol production.
Purpose of the Study:
- To engineer *Escherichia coli* for efficient biosynthesis of gadusol.
- To develop high-throughput methods for gadusol quantification and strain screening.
- To establish a robust microbial production platform for gadusol.
Main Methods:
- Reprogramming of the gadusol biosynthesis pathway in *E. coli*.
- Development of a colorimetric assay for high-throughput screening.
- Small RNA library screening to identify regulatory targets.
- Directed evolution of transketolase A and cofactor optimization.
- Fed-batch fermentation for large-scale production.
Main Results:
- Initial gadusol titer of 45.2 mg/l achieved after pathway reprogramming.
- Titer increased to 700 mg/l through small RNA screening and regulatory target identification.
- Further optimization led to a titer of 965 mg/l via enzyme evolution and cofactor balancing.
- Final production reached 4.2 g/l using a fed-batch fermentation strategy.
Conclusions:
- Systematic engineering of *E. coli* enabled efficient gadusol biosynthesis.
- The developed framework facilitates rapid screening and construction of microbial cell factories.
- This study provides a scalable method for producing gadusol, addressing its availability challenges.
