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Enabling Plasmid-Based Expression in Clostridium kluyveri Using a Biparental Methylation-Conjugation System
Ethan M Agena1, Abiali A Badani1, Blake G Lindner1
1Department of Chemical Engineering and Applied Chemistry, The University of Toronto, Toronto, Ontario M5T 3E5, Canada.
ACS Synthetic Biology
|March 18, 2026
Summary
Researchers engineered Clostridium kluyveri for better biomanufacturing. A new system overcomes host defenses, enabling stable plasmid delivery for improved production of valuable chemicals from waste.
Area of Science:
- Synthetic Biology
- Metabolic Engineering
- Industrial Biotechnology
Background:
- Clostridium kluyveri is a key biocatalyst for producing medium-chain carboxylic acids (MCCAs) from waste carbon via chain elongation.
- MCCAs are valuable platform chemicals with applications in agriculture, food, cosmetics, and fuels.
- Engineering C. kluyveri is challenging due to host defense systems, limiting improvements in product yield, chain length control, and oleochemical production.
Purpose of the Study:
- To develop a genetic tool system for C. kluyveri to overcome restriction-modification barriers.
- To enable stable plasmid delivery for metabolic engineering and heterologous gene expression.
- To advance the biomanufacturing capabilities of C. kluyveri and similar chain-elongating bacteria.
Main Methods:
- Development of a streamlined, biparental methylation-conjugation system for C. kluyveri DSM555T.
- Bypassing restriction-modification barriers to achieve stable plasmid delivery.
- Demonstration of heterologous expression of anaerobic fluorescent reporters (FAST and FbFP).
Main Results:
- Successful establishment of a novel genetic system for C. kluyveri.
- Stable delivery and expression of heterologous genes, including fluorescent reporters.
- Overcoming host defense mechanisms to facilitate genetic manipulation.
Conclusions:
- The developed methylation-conjugation system significantly advances metabolic engineering in C. kluyveri.
- This toolset enables broader adoption of genetic engineering in chain-elongating bacteria.
- Expanded applications of anaerobic chain elongation in industrial biomanufacturing are now feasible.
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