Cited by 51Bacterial biofilms and quorum sensingBacterial Genetics and BiotechnologyPolyamine Metabolism and Applications

Gamma-aminobutyric acid acts as a specific virulence regulator in Pseudomonas aeruginosa

Dagorn, Audrey, Hillion, Mélanie, Chapalain, Annelise, Lesouhaitier, Olivier, Duclairoir Poc, Cécile, Vieillard, Julien, Chevalier, Sylvie, Taupin, Laure +2 more·2013·Microbiology

Abstract

Gamma-aminobutyric acid (GABA) is widespread in the environment and can be used by animal and plants as a communication molecule. Pseudomonas species, in particular fluorescent ones, synthesize GABA and express GABA-binding proteins. In this study, we investigated the effects of GABA on the virulence of Pseudomonas aeruginosa. While exposure to GABA (10 µM) did not modify either the growth kinetics or the motility of the bacterium, its cytotoxicity and virulence were strongly increased. The Caenorhabditis elegans 'fast killing test' model revealed that GABA acts essentially through an increase in diffusible toxin(s). GABA also modulates the biofilm formation activity and adhesion properties of PAO1. GABA has no effect on cell surface polarity, biosurfactant secretion or on the lipopolysaccharide structure. The production of several exo-enzymes, pyoverdin and exotoxin A is not modified by GABA but we observed an increase in cyanogenesis which, by itself, could explain the effect of GABA on P. aeruginosa virulence. This mechanism appears to be regulated by quorum sensing. A proteomic analysis revealed that the effect of GABA on cyanogenesis is correlated with a reduction of oxygen accessibility and an over-expression of oxygen-scavenging proteins. GABA also promotes specific changes in the expression of thermostable and unstable elongation factors Tuf/Ts involved in the interaction of the bacterium with the host proteins. Taken together, these results suggest that GABA is a phy…

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Crossref · 10.1099/mic.0.061267-0

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  • Administration of GABA to Pseudomonas aeruginosa culture increases the organism's virulence.

    “the administration of GABA to Pseudomonas aeruginosa culture has been demonstrated to increase the organism's virulence (Dagorn et al., 2013).”

    From The Microbiota-Gut-Brain Axis (2019) · cites this paper as Dagorn et al., 2013

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Authors
Dagorn, A., Hillion, M., Chapalain, A., Lesouhaitier, O., Duclairoir Poc, C., Vieillard, J., Chevalier, S., Taupin, L., Le Derf, F., & Feuilloley, M. G. J.
Affiliations
  • Université de Rouen Normandie (FR)
  • Laboratory of Microbiology Signals and Microenvironment (LMSM) EA 4312, University of Rouen, 27000 Evreux, France
  • Laboratoire COBRA (FR)
  • Université de Bretagne Sud (FR)
  • SIMA, UMR 6014 COBRA, University of Rouen, 27000 Evreux, France
Venue
Microbiology
Published
2013-02-01
Volume
159
Issue
Pt_2
Pages
339-351
ISSN
  • 1350-0872 (ISSN-L)
  • 1465-2080
OpenAlex
W2159273899
Cited by
51
References
61
Citations by year
2026: 5 · 2025: 3 · 2024: 4 · 2023: 1 · 2022: 2 · 2021: 8 · 2020: 5 · 2019: 5 · 2018: 7 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 1
FWCI
0.64
Type
journal article
Language
en
Open access
closed
Locations
  • Microbiology (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Polyamine Metabolism and Applications
Keywords
GABA, Pseudomonas aeruginosa, bacterial virulence, cyanogenesis, quorum sensing, biofilm formation, bacterial adhesion, oxygen availability, pyoverdine, exotoxin A, host-pathogen interaction
MeSH terms
Animals, Bacterial Toxins, gamma-Aminobutyric Acid, Locomotion, Pseudomonas aeruginosa, Gene Expression Regulation, Bacterial, Survival Analysis, Caenorhabditis elegans, Proteome, Virulence Factors

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