How Salmonella Uses PhoP to Control a Key Virulence Gene
Author Information
Author(s): Gal-Mor Ohad, Elhadad Dana, Deng Wanyin, Rahav Galia, Finlay Brett B., Chakravortty Dipshikha
Primary Institution: Infectious Diseases Research Laboratory, Sheba Medical Center
Hypothesis
Does the PhoP regulatory system directly control the expression of the SPI-2 effector gene sseL in Salmonella enterica?
Conclusion
PhoP directly activates the sseL gene in Salmonella enterica, which is crucial for its virulence.
Supporting Evidence
- PhoP directly binds to the promoter region of sseL.
- SseL is essential for Salmonella's virulence in mice.
- PhoP's activation of sseL occurs independently of the SsrB system.
- The sseL promoter is highly conserved among different Salmonella serovars.
- Mutations in PhoP affect its ability to activate sseL expression.
Takeaway
Salmonella has a special system called PhoP that helps it turn on a gene called sseL, which is important for making the bacteria sick.
Methodology
The study used differential fluorescence induction screens, β-galactosidase reporter assays, and quantitative real-time PCR to analyze gene expression.
Limitations
The study primarily focuses on a single gene and may not account for the full complexity of Salmonella's regulatory networks.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.0001
Digital Object Identifier (DOI)
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