Related Experiment Video

Updated: Jul 15, 2026

Qualitative and Quantitative Analysis of Siderophore Production from Pseudomonas aeruginosa
05:09

Qualitative and Quantitative Analysis of Siderophore Production from Pseudomonas aeruginosa

Published on: March 15, 2024

Ferripyochelin uptake genes are involved in pyochelin-mediated signalling in Pseudomonas aeruginosa

Laurent Michel1, Aude Bachelard1, Cornelia Reimmann1

  • 1Département de Microbiologie Fondamentale, Université de Lausanne, CH-1015 Lausanne, Switzerland.

Microbiology (Reading, England)
|April 28, 2007
PubMed

Insights

Pseudomonas aeruginosa uses pyochelin for iron uptake. The ferripyochelin transport system, including FptA and FptX, is crucial for both iron acquisition and signaling, influencing pyochelin production.

Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Iron Metabolism

Background:

  • Pseudomonas aeruginosa produces pyochelin, a siderophore, to scavenge iron during starvation.
  • Pyochelin uptake involves the outer-membrane receptor FptA and inner-membrane permease FptX.
  • Extracellular pyochelin also functions as a signal to regulate its own biosynthesis and uptake genes via PchR activation.

Purpose of the Study:

  • To investigate the role of ferripyochelin uptake genes in pyochelin-mediated signaling.
  • To determine the necessity of the fptABCX operon components for pyochelin utilization, signaling, and production.

Main Methods:

  • Genetic analysis of Pseudomonas aeruginosa mutants with deletions or mutations in fptA, fptX, fptB, and fptC genes.
  • Evaluation of pyochelin utilization, signaling induction, and pyochelin production in wild-type and mutant strains.

Main Results:

  • The fptA and fptX genes are essential components of the conserved fptABCX ferripyochelin transport operon.
  • Mutations in fptA and fptX impaired iron utilization, disrupted signaling, and reduced pyochelin production.
  • The fptB and fptC genes were found to be dispensable for pyochelin utilization, signaling, and production.

Conclusions:

  • The ferripyochelin transport system, particularly FptA and FptX, plays a significant role in pyochelin-mediated signaling.
  • Pyochelin-mediated signaling largely operates through the ferripyochelin transport system, highlighting a feedback mechanism.

More Related Videos

FLIM-FRET Measurements of Protein-Protein Interactions in Live Bacteria.09:26

FLIM-FRET Measurements of Protein-Protein Interactions in Live Bacteria.

Published on: August 25, 2020

Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...