Quorum Sensing Mechanisms in Chromobacterium violaceum Infections

Chromobacterium violaceum is an environmental opportunistic pathogen whose capacity to cause severe infections is tightly controlled by quorum sensing (QS). Central to this process is the CviI/CviR system, in which the synthase CviI produces N‐acyl‐homoserine lactone (AHL) signals that, upon reaching threshold concentrations, activate the transcriptional regulator CviR. This activation governs key virulence traits: violacein pigment synthesis, biofilm formation, motility and secretion of degradative enzymes. Beyond classical QS outputs, CviR can also influence processes independently of its cognate AHL, integrating inputs from siderophore‐mediated iron uptake and additional regulators such as VioS and VitR. The resulting network allows C. violaceum to coordinate population‐level behaviour, adapt to host environments and evade immune defences, thereby amplifying its pathogenic potential in wound or bloodstream infections.

Research from Nature Portfolio

Recent studies have applied computational screening of fungal metabolites from Cladosporium species to identify novel inhibitors of the CviR receptor. A series of six candidate compounds demonstrated docking affinities surpassing those of standard comparators, with Coniochaetone K emerging as the top hit. Molecular dynamics simulations over 160 ns confirmed stable binding interactions and favourable binding free energies. In silico pharmacokinetic predictions further indicated drug‐like properties, supporting Coniochaetone K as a promising lead for development of broad‐spectrum QS inhibitors targeting C. violaceum and related pathogens.

Quorum Sensing Mechanisms in Chromobacterium violaceum Infections publication trend

The graph below shows the total number of articles in quorum sensing mechanisms in chromobacterium violaceum infections across all publications each year (not limited to Nature Index journals).

Technical terms

Quorum sensing (QS): A bacterial communication mechanism that synchronises gene expression across a population through diffusible signal molecules.

N‐acyl‐homoserine lactones (AHLs): Small signal molecules synthesised by many Gram‐negative bacteria, serving as autoinducers detected by LuxR‐type receptors.

CviI/CviR system: The principal AHL synthase–receptor circuit in C. violaceum that controls density‐dependent virulence factors.

Violacein: A purple bisindole pigment regulated by QS, used as a phenotypic indicator of QS activity and contributing to virulence.

Biofilm: A multicellular aggregate of bacteria embedded in an extracellular matrix, regulated by QS and associated with persistent infections.

Siderophores: Iron‐chelating molecules secreted by bacteria to acquire iron, whose production can be intertwined with QS regulatory networks.

Molecular docking: A computational technique used to predict the preferred orientation and binding strength of small molecules to protein targets.

References

1. 2,3-Dimethoxycinnamic Acid from a Marine Actinomycete, a Promising Quorum Sensing Inhibitor in Chromobacterium violaceum. Marine Drugs (2024).
2. A quorum-sensing regulatory cascade for siderophore-mediated iron homeostasis in Chromobacterium violaceum. mSystems (2024).
3. Anti-Biofilm and Anti-Quorum-Sensing Activity of Inula Extracts: A Strategy for Modulating Chromobacterium violaceum Virulence Factors. Pharmaceuticals (2024).
4. Exploration of CviR-mediated quorum sensing inhibitors from Cladosporium spp. against Chromobacterium violaceum through computational studies. Scientific Reports (2023).
5. Regulation of virulence in Chromobacterium violaceum and strategies to combat it. Frontiers in Microbiology (2024).
6. Negative Regulation of Violacein Biosynthesis in Chromobacterium violaceum. Frontiers in Microbiology (2017).