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Related Concept Videos

Mechanism of Conjugation01:19

Mechanism of Conjugation

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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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Conjugation01:19

Conjugation

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Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
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Related Experiment Video

Updated: Mar 19, 2026

Site-specific Bacterial Chromosome Engineering: &#934;C31 Integrase Mediated Cassette Exchange (IMCE)
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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.

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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.

Keywords:
Clostridium kluyverianaerobic fermentationconjugationmethylomicsmicrobial chain elongationnonmodel microbesrestriction-modification systems

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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.