Bacterial quorum sensing and virulence regulatory pathways (QS pathways)

Bacterial quorum sensing (QS) and virulence regulatory pathways are sophisticated communication systems that allow bacteria to monitor their population density and coordinate collective behaviors [1.1.1]. These pathways rely on the production and detection of signaling molecules called autoinducers, which, upon reaching a critical concentration, activate specific receptors to regulate the expression of virulence factors and biofilm formation [1.1.5]. In many pathogens, such as Pseudomonas aeruginosa and Staphylococcus aureus, these systems are essential for establishing and maintaining infections [1.1.2]. Targeting these pathways, often referred to as "quorum quenching," represents a promising anti-virulence strategy that aims to attenuate bacterial pathogenicity without directly killing the bacteria, thereby potentially reducing the selective pressure for the development of antibiotic resistance [1.1.1, 1.1.4]. Key molecular targets within these pathways include LuxR-type transcription factors, signal synthases like LuxI, and two-component regulatory systems [1.1.3]. Several existing drugs, including niclosamide and azithromycin, have been identified as having QS-inhibitory properties, and novel small molecules are being developed to specifically disrupt these signaling networks [1.1.3, 1.1.5].

Other names

Quorum sensing systemBacterial cell-to-cell communicationAnti-virulence pathwaysQS-controlled virulence pathwaysQuorum-sensing signaling

Inhibition of autoinducer synthesis, competitive or non-competitive antagonism of signal receptors (e.g., LasR, PqsR), enzymatic degradation of signal molecules (quorum quenching), and interference with downstream virulence gene expression regulatory circuits [1.1.1, 1.1.3].