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Related Concept Videos

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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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Interfering with Bacterial Quorum Sensing.

Kerstin Reuter1, Anke Steinbach2, Volkhard Helms3

  • 1Center for Bioinformatics, Saarland University, Saarbrücken, Germany.; Saarbrücken Graduate School of Computer Science, Saarland University, Saarbrücken, Germany.

Perspectives in Medicinal Chemistry
|January 29, 2016
PubMed
Summary
This summary is machine-generated.

Quorum sensing (QS) allows bacteria to communicate using chemical signals (autoinducers) to coordinate group behaviors. Targeting bacterial QS systems offers a promising strategy to develop anti-infective compounds with reduced resistance development.

Keywords:
Pseudomonas aeruginoasStaphylococcus aureusVibrio fischeriautoinducerquorum sensing inhibitorsvirulence

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Area of Science:

  • Microbiology
  • Bacterial Communication
  • Molecular Biology

Background:

  • Quorum sensing (QS) is a cell-to-cell communication mechanism used by bacteria.
  • Bacteria use QS to regulate gene expression based on population density via autoinducer (AI) molecules.
  • AI molecules trigger phenotypes like virulence or luminescence when concentrations exceed a threshold.

Purpose of the Study:

  • To review quorum sensing systems in key bacterial pathogens.
  • To discuss antivirulence strategies targeting QS machinery.
  • To explore the potential of QS inhibitors as anti-infective agents.

Main Methods:

  • Literature review of QS systems in Gram-negative and Gram-positive bacteria.
  • Analysis of antivirulence strategies targeting QS components.
  • Discussion of the implications for developing novel anti-infective compounds.

Main Results:

  • QS regulates bacterial phenotypes crucial for survival and virulence.
  • Targeting QS may reduce selective pressure, potentially avoiding resistance development.
  • Specific QS systems in Vibrio fischeri, Pseudomonas aeruginosa, and Staphylococcus aureus were examined.

Conclusions:

  • QS is a critical regulatory mechanism in bacterial populations.
  • Inhibiting QS components presents a viable strategy for novel anti-infective therapies.
  • QS-targeted antivirulence approaches offer a promising alternative to traditional antibiotics.