Quorum Quenching
Quorum Quenching - Related Videos
07:47
Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases
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Cited by 7 •
2016
Quorum-quenching enzymes are anti-virulent and anti-bacterial options that can mitigate pathogenesis without risk of incurring resistance, by preventing the expression of virulence factors and genes associated with antibiotic resistance and biofilm formation. In this study, we report a method that demonstrates the efficacy of quorum-quenching enzymes in bacterial biofilm disruption.
10:57
Quenching and Boiling
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2023
Source: Alexander S Rattner, Sanjay Adhikari, and Mahdi Nabil; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Controlled heating followed by rapid cooling is an important element of many materials processing applications. This heat-treating procedure can increase material hardness, which is important for cutting tools or surfaces in high wear environments. The rapid cooling stage is called quenching, and is often performed by immersing...
08:58
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
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Cited by 27 •
2011
We present an experimental procedure for measuring the partial pressure of oxygen (pO2) in cerebral vasculature based on oxygen-dependent quenching of phosphorescence. Animal preparation and imaging procedures were outlined for both large field of view CCD-based imaging of pO2 in rats and 2-photon excitation based imaging of pO2 in mice.
01:28
Gene Regulation in Microbial Communities: Quorum Sensing
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2025
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,...
03:29
Synthesis and Assay of Vibrio Quorum Sensing Inhibitors
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2024
Thiophenesulfonamide compounds are potent and specific inhibitors of Vibrio quorum sensing regulators LuxR/HapR that block their activity in vivo, thus preventing transcription of genes for virulence, motility, and biofilms. This protocol details how these compounds are synthesized, modeled in silico, and assayed in vivo for activity against LuxR/HapR.
FAQs
Quorum quenching can target several stages of communication: signaling molecules may be degraded or chemically modified, their synthesis or transport may be blocked, or their regulatory receptors may be prevented from binding them. These alternatives matter because they interrupt the pathway at different control points, allowing researchers to examine which stage most strongly affects quorum-sensing-controlled gene expression.
When quorum-sensing signals no longer activate their regulatory receptors, bacteria reduce expression of genes controlled by that system. The resulting effects can extend beyond communication itself, influencing biofilm formation, virulence, motility, and cooperative metabolism. This connects a molecular intervention to community-level phenotypes and helps explain how coordinated bacterial behaviors depend on signal-dependent regulation.
Quorum sensing is the communication process that links cell density with coordinated gene regulation, whereas quorum quenching refers to interference with that process. The distinction is useful because quenching can be analyzed by its specific point of action, such as signal degradation, blocked synthesis, impaired transport, or receptor interference, rather than treating communication as a single undifferentiated event.
Each component provides a different explanation for reduced communication. Loss of a signaling molecule may result from degradation or modification, while reduced transport can limit its movement and receptor interference can prevent signal recognition. Separating these possibilities helps researchers connect the mechanism of disruption with changes in quorum-sensing-controlled genes and associated bacterial behaviors.
A study can evaluate activity by examining whether quorum-sensing-controlled gene expression decreases and whether related community behaviors change. Relevant outcomes include altered biofilm formation, virulence, motility, or cooperative metabolism. Comparing these effects with the suspected intervention point can help determine whether the disruption acts through signal chemistry, synthesis, transport, or receptor binding.
Quorum quenching is relevant when researchers need to understand or reduce coordinated bacterial behavior. Its applications include investigating anti-biofilm strategies and alternatives to conventional antibiotics, with broader potential in medicine, environmental biotechnology, food safety, and agriculture. These contexts use the same communication principles while addressing different consequences of collective bacterial activity.