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Updated: Jul 30, 2025

Generation of In-Frame Gene Deletion Mutants in Pseudomonas aeruginosa and Testing for Virulence Attenuation in a Simple Mouse Model of Infection
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Pseudomonas virulence factor controls expression of virulence genes in Pseudomonas entomophila

Katie A Acken1, Bo Li1,2

  • 1Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America.

Plos One
|May 18, 2023
PubMed

Insights

The Pseudomonas virulence factor (Pvf) system regulates approximately 300 genes in Pseudomonas entomophila, impacting virulence and essential cellular functions. Understanding Pvf is key to developing anti-virulence strategies against bacterial pathogens.

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Quorum sensing (QS) enables bacterial communication for coordinated gene expression based on cell density.
  • Pathogenic bacteria utilize QS to control virulence factors and biofilm formation, crucial for infection.
  • The Pseudomonas virulence factor (Pvf) gene cluster is found in numerous proteobacteria, affecting plant and human hosts.

Purpose of the Study:

  • To identify genes regulated by the Pvf signaling system in the insect pathogen Pseudomonas entomophila L48.
  • To investigate the role of Pvf in controlling virulence mechanisms in a model strain lacking other known QS systems.

Main Methods:

  • Comparative transcriptomic analysis of wildtype P. entomophila and a pvf deletion mutant (ΔpvfA-D).
  • Identification of differentially expressed genes and putative biosynthetic gene clusters.

Main Results:

  • Deletion of pvfA-D impacted the expression of approximately 300 genes.
  • Affected genes are involved in virulence, type VI secretion system, siderophore transport, and amino acid biosynthesis.
  • Seven putative biosynthetic gene clusters showed reduced expression in the ΔpvfA-D mutant.

Conclusions:

  • The Pvf system regulates multiple virulence mechanisms in P. entomophila.
  • Characterizing Pvf-regulated genes enhances understanding of host-pathogen interactions.
  • Findings support the development of anti-virulence strategies targeting Pvf in P. entomophila and related strains.

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