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Gene Regulation in Microbial Communities: Quorum Sensing01:28

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Quorum quenching: role in nature and applied developments.

Catherine Grandclément1, Mélanie Tannières1, Solange Moréra2

  • 1Institut for Integrative Biology of the Cell, Department of Microbiology, CNRS CEA Paris-Sud University, Saclay Plant Sciences, Avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France.

FEMS Microbiology Reviews
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Quorum quenching (QQ) disrupts bacterial communication (quorum sensing, QS) by interfering with QS signals. This review explores QQ mechanisms and applications in medicine and agriculture.

Keywords:
AgrobacteriumChromobacteriumPseudomonasacylaseamidaseanti-virulencehomoserine lactonelactonaseparaoxonasequorum-sensing inhibitors

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Area of Science:

  • Microbiology
  • Bacterial Communication
  • Biochemistry

Background:

  • Quorum sensing (QS) enables bacteria to coordinate gene expression based on population density.
  • QS regulates crucial processes like biofilm formation, horizontal gene transfer, and host-microbe interactions.
  • QS relies on the synthesis, exchange, and perception of autoinducers (QS signals).

Purpose of the Study:

  • To review the diverse phenomena and mechanisms of quorum quenching (QQ), the disruption of QS signaling.
  • To understand the targets of QQ and its natural evolution.
  • To explore applied perspectives and potential QQ strategies.

Main Methods:

  • Surveying QS signal diversity and QS-associated responses.
  • Presenting mechanisms, targets, and molecular actors of QS interference.
  • Highlighting natural QQ enzymes and chemical QS inhibitors.
  • Detailing QQ paradigms in microbe-microbe and host-microbe interactions.

Main Results:

  • QQ encompasses diverse mechanisms and phenomena targeting QS signaling.
  • Natural QQ enzymes and chemical inhibitors are key molecular actors.
  • QQ plays significant roles in microbial and host interactions.
  • QQ strategies show promise in various applied fields.

Conclusions:

  • QQ is a versatile strategy for modulating bacterial behavior.
  • Understanding QQ mechanisms is crucial for developing novel applications.
  • QQ holds potential for applications in medicine, aquaculture, crop production, and anti-biofouling.