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Related Experiment Video

Updated: Jul 7, 2025

Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
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Plasmid-encoded toxin defence mediates mutualistic microbial interactions.

Sarah Moraïs1,2,3, Michael Mazor1,2,3, Omar Tovar-Herrera1,2,3

  • 1National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Be'er Sheva, Israel.

Nature Microbiology
|December 27, 2023
PubMed
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Plasmids in the gut microbiome can mediate beneficial interactions. A specific plasmid confers resistance to the toxin reuterin, fostering mutualism between Lactobacilli and Enterococci species.

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Area of Science:

  • Microbiology
  • Genetics
  • Ecology

Background:

  • Plasmids are common in gut microbial ecosystems, facilitating gene exchange and accessory functions.
  • The specific impact of plasmids on microbial community composition and function is not well understood.
  • Bacterial toxins and plasmid-encoded resistance mechanisms play roles in inter-microbial interactions.

Purpose of the Study:

  • To investigate the ecological role of a prevalent plasmid in mediating interactions between Lactobacilli and Enterococci.
  • To identify the specific toxin and resistance mechanism involved in these interactions.
  • To explore the impact of plasmid-mediated interactions on microbial community structure and function.

Main Methods:

  • Biochemical characterization of a plasmid-encoded defense mechanism.
  • Targeted metabolomic analysis to detect reuterin prevalence in rumen ecosystems.
  • In vitro studies of Enterococcus strains with L. reuteri to analyze interactions.

Main Results:

  • A plasmid-borne resistance mechanism against the bacterial toxin reuterin was identified.
  • Reuterin is prevalent in rumen ecosystems and influences microbial community structure.
  • The plasmid mediates a beneficial metabolic exchange, leading to mutualism between Enterococcus and L. reuteri.

Conclusions:

  • Plasmid-coded defense systems can mediate beneficial inter-species interactions within microbial communities.
  • This study reveals a novel ecological role for plasmids in fostering mutualism.
  • Understanding plasmid functions is crucial for comprehending gut microbiome dynamics.