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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 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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Peptide pheromone signaling in Streptococcus and Enterococcus.

Laura C Cook1, Michael J Federle

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Summary

Bacteria use quorum sensing (QS) to communicate using peptide pheromones. This review details four main types of Gram-positive bacterial QS pathways, highlighting their roles in various behaviors and interspecies communication.

Keywords:
Firmicutesbiofilmscompetencegene regulationintercellular communicationvirulence

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Area of Science:

  • Microbiology
  • Bacterial Communication
  • Molecular Biology

Background:

  • Intercellular chemical signaling, or quorum sensing (QS), enables bacterial communities to coordinate responses.
  • Gram-positive bacteria utilize small peptides as pheromones for QS.
  • Four main types of QS pathways exist in Gram-positive bacteria based on peptide structure and signaling systems.

Purpose of the Study:

  • To review and classify Gram-positive bacterial quorum sensing pathways.
  • To highlight the role of peptide pheromones in bacterial signaling.
  • To provide examples from Enterococcus and Streptococcus genera.

Main Methods:

  • Literature review of bacterial pheromone signaling pathways.
  • Classification of pathways based on peptide structure and sensory system architecture.
  • Analysis of conserved pheromones and overlapping QS systems.

Main Results:

  • Identified four major types of Gram-positive bacterial QS pathways: Agr-type cyclical peptides, Gly-Gly processing motifs, RNPP family systems, and Rgg-like regulatory family.
  • The Rgg-like family's response to peptide pheromones expands the known scope of QS.
  • QS pathways regulate critical bacterial behaviors like conjugation, competence, biofilm formation, and virulence.

Conclusions:

  • Gram-positive bacterial QS pathways are diverse and regulate fundamental behaviors.
  • Conserved pheromones and overlapping pathways facilitate interspecies communication.
  • Further research into Rgg-like systems and interspecies signaling is warranted.