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Accessory Gene Regulator (agr) Quorum-Sensing System (agr)
- Target
- agr
- Molecular classification
- Two-component signal transduction system, Quorum sensing system, Histidine kinase receptor, Response regulator, Regulatory RNA, Transcription factor
01
Overview
The Staphylococcus aureus agr quorum-sensing system is a sophisticated regulatory network essential for controlling virulence gene expression based on population density. It enables rapid adaptation between colonization/biofilm states and aggressive tissue invasion through coordinated regulation mediated primarily by autoinducing peptides sensed via a two-component signaling module (AgrC/AgrA) with downstream effects executed largely through the multifunctional regulatory sRNA RNAIII.
- Other names
- Accessory Gene Regulatoragr Quorum Sensing Systemagr systemRNAIII activating proteinAutoinducing peptide system
02
Mechanism of action
Inhibition of AgrC histidine kinase activity, disruption of AgrA phosphorylation, interference with AIP binding, or targeting RNAIII function to block downstream gene expression. Some drugs aim to prevent AIP processing or secretion.
03
Biological functions
Quorum sensingRegulation of virulence factor expressionRegulation of biofilm formationSignal transductionGene regulationImmune evasion
04
Disease associations
InfectionStaphylococcus aureus infectionsAbscessesSepsisChronic infectionsBiofilm-associated infections
05
Safety considerations
Potential for off-target effects on other bacterial speciesDevelopment of resistance mechanisms through mutations in agr components or bypass pathwaysUnintended consequences of disrupting quorum sensing on microbial communitiesSubtle impacts on the host immune system due to virulence factor modulation
06
Interacting drugs
AIP inhibitors (synthetic)
3 more in the full profile.
07
Biomarkers
AIP concentrationRNAIII levelsExpression levels of agr-regulated virulence factors (e.g., hemolysins, proteases)agr allelic variants
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