Quorum Sensing Mechanisms in Staphylococcus aureus Pathogenesis
Summary
Staphylococcus aureus employs a sophisticated quorum sensing network to coordinate virulence, biofilm formation and dispersal in response to population density. Central to this network is the accessory gene regulator (agr) system, a peptide-mediated two-component circuit that controls expression of toxins, enzymes and adhesion factors. At low cell density, agr activity is minimal, favouring surface attachment and biofilm maturation. As cell numbers rise, accumulation of an autoinducing peptide (AIP) ligand triggers a sensor kinase, AgrC, which phosphorylates the response regulator AgrA. Activated AgrA induces RNAIII transcription, upregulating exoproteins and downregulating surface adhesins. This switch orchestrates biofilm detachment, immune evasion and tissue invasion. Cross-talk among agr subtypes and interference by peptides from other microbes further modulates S. aureus behaviour in mixed communities. Quorum sensing thus underpins the balance between chronic colonisation and acute infection, making agr signalling a pivotal target for novel anti-virulence strategies.
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Quorum Sensing Mechanisms in Staphylococcus aureus Pathogenesis publication trend
The graph below shows the total number of articles in quorum sensing mechanisms in staphylococcus aureus pathogenesis across all publications each year (not limited to Nature Index journals).
Technical terms
Quorum Sensing: Cell-density dependent communication by secreted signals that synchronise gene expression across a bacterial population.
Autoinducing Peptide (AIP): Short, post-translationally modified peptide that accumulates extracellularly to activate a cognate sensor kinase in Gram-positive bacteria.
Accessory Gene Regulator (agr) System: A peptide-mediated two-component regulatory circuit that controls virulence gene expression and biofilm dynamics in S. aureus.
Biofilm: Structured bacterial community embedded in an extracellular matrix, providing protection from antimicrobials and host defences.
Quorum Quenching: Interference with quorum sensing signalling to attenuate virulence without killing the pathogen.
Virulence Factor: Molecule or structure produced by a pathogen that contributes to disease causation or severity.
References
- Bacillus subtilis-derived peptides disrupt quorum sensing and biofilm assembly in multidrug-resistant Staphylococcus aureus. mSystems (2024).
- Critical Assessment of the Prospects of Quorum-Quenching Therapy for Staphylococcus aureus Infection. International Journal of Molecular Sciences (2023).
- agr-Mediated Dispersal of Staphylococcus aureus Biofilms. PLOS Pathogens (2008).
- Quorum-sensing regulation in staphylococci—an overview. Frontiers in Microbiology (2015).
- Cross-Talk between Staphylococcus aureus and Other Staphylococcal Species via the agr Quorum Sensing System. Frontiers in Microbiology (2016).
- Molecular determinants of staphylococcal biofilm dispersal and structuring. Frontiers in Cellular and Infection Microbiology (2014).
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