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Updated: Jul 12, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
Published on: February 19, 2019
The PrfA virulence regulon.
Mariela Scortti1, Héctor J Monzó, Lizeth Lacharme-Lora
1Bacterial Molecular Pathogenesis Group, Veterinary Molecular Microbiology Section, Faculty of Medical and Veterinary Sciences, University of Bristol, Langford, UK.
The PrfA protein regulates virulence in Listeria monocytogenes, controlling infection stages. Its activity integrates signals for precise gene expression, despite a small direct regulon.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Molecular Biology
Background:
- PrfA is a key transcription factor for Listeria monocytogenes virulence.
- It controls essential steps in the intracellular infection cycle.
- The PrfA regulon is surprisingly small given the pathogen's complex lifestyle.
Purpose of the Study:
- To investigate the regulation of virulence gene expression by PrfA.
- To understand how PrfA integrates environmental signals for spatio-temporal control.
- To elucidate the mechanisms of PrfA activity and its broader physiological influence.
Main Methods:
- Analysis of PrfA binding to promoter elements.
- Investigating transcriptional, translational, and post-translational regulatory mechanisms.
- Exploring indirect mechanisms of PrfA influence on L. monocytogenes physiology.
Main Results:
- PrfA activates transcription by binding to a specific palindromic promoter sequence.
- PrfA integrates signals for regulated expression, with maximal induction in the host cytosol.
- Regulation involves changes in PrfA activity and concentration through multiple control mechanisms.
- Evidence suggests PrfA has a global impact on bacterial physiology beyond direct targets.
Conclusions:
- PrfA is a central regulator of Listeria monocytogenes virulence, adapting expression to the host environment.
- Its precise control mechanisms ensure efficient intracellular parasitism.
- PrfA's influence extends beyond its direct regulon, impacting overall bacterial physiology.
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