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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 by a type IVA secretion system effector.

Jinxing Liao1, Zihan Li1, Dan Xiong1

  • 1College of Plant Protection, Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests, Nanjing Agricultural University, Nanjing, China.

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A novel bacterial mechanism uses effector translocation to block acyl-homoserine lactone (AHL) production, conferring a competitive advantage. This discovery offers new strategies for controlling bacterial infections by disrupting quorum sensing.

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Area of Science:

  • Microbiology
  • Bacterial Communication
  • Molecular Biology

Background:

  • Proteobacteria use acyl-homoserine lactones (AHLs) for quorum sensing, crucial for pathogen infections.
  • Enzymatic AHL degradation is a known quorum-quenching strategy.
  • Bacterial interspecies competition involves complex communication and defense mechanisms.

Purpose of the Study:

  • To identify novel quorum-quenching mechanisms beyond enzymatic degradation.
  • To investigate the role of type IVA secretion system (T4ASS) effectors in interspecies communication.
  • To explore the potential of a novel effector, LqqE1, in blocking AHL synthesis.

Main Methods:

  • Identified a T4ASS effector (Le1288) from Lysobacter enzymogenes OH11.
  • Translocated Le1288 into Pseudomonas fluorescens 2P24.
  • Investigated the interaction between Le1288 and the AHL synthase PcoI.
  • Assessed the ecological impact of this novel quorum-quenching mechanism.

Main Results:

  • Le1288, termed LqqE1, inhibits AHL production by binding to the AHL synthase PcoI.
  • LqqE1 blocks PcoI's recognition of S-adenosy-L-methionine, a key substrate for AHL synthesis.
  • This effector-mediated quorum-quenching provides a competitive advantage to L. enzymogenes OH11.
  • The mechanism was observed in other T4ASS-producing bacteria and has potential applications.

Conclusions:

  • Discovered a novel quorum-quenching mechanism involving T4ASS effector translocation.
  • LqqE1 represents a new class of quorum-quenching molecules that inhibit AHL synthesis.
  • This finding highlights the ecological significance of effector-mediated interspecies communication.
  • LqqE1 has potential applications in controlling human and plant pathogens like Pseudomonas aeruginosa and Ralstonia solanacearum.