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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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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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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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The Quorum Sensing-Controlled Competence Regulon Drives H2O2 Production in Streptococcus gordonii.

Alec A Brennan1, Clay P Renshaw1, Steven C Tata1

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Streptococcus gordonii produces hydrogen peroxide via its competence regulon, which aids in antagonizing Streptococcus mutans. This highlights S. gordonii

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Area of Science:

  • Oral microbiology
  • Bacterial communication and gene regulation
  • Biochemistry and molecular biology

Background:

  • Streptococcus gordonii is a beneficial oral bacterium and early colonizer.
  • Hydrogen peroxide production by S. gordonii is linked to spxB expression.
  • The connection between S. gordonii's competence regulon and peroxide formation was unexplored.

Purpose of the Study:

  • To investigate the link between the S. gordonii competence regulon quorum sensing (QS) circuitry and downstream phenotypes.
  • To explore the role of competence-stimulating peptide (CSP) in regulating peroxide formation.
  • To analyze structure-activity relationships of the native CSP.

Main Methods:

  • Confirmation of native CSP and RNA-sequencing (RNA-seq) after CSP incubation.
  • Structure-activity relationship (SAR) analyses of the CSP.
  • Phenotypic assessment of peroxide formation and interspecies competition assays against S. mutans.

Main Results:

  • RNA-seq revealed transcriptomic changes upon CSP exposure.
  • SAR analysis identified key residues for CSP:ComD binding and activation.
  • Peroxide formation was modulated by the competence regulon, and S. gordonii significantly inhibited S. mutans growth via hydrogen peroxide.

Conclusions:

  • The competence regulon regulates hydrogen peroxide production in S. gordonii.
  • S. gordonii antagonizes S. mutans growth primarily through hydrogen peroxide.
  • S. gordonii's beneficial phenotypes, regulated by the competence pathway, suggest potential for therapeutic exploitation.