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Related Experiment Videos

Measuring the immeasurable.

John C Newman1, Alan Weiner

  • 1Department of Biochemistry, School of Medicine, University of Washington, Seattle, WA 98195, USA.

Molecular Cell
|November 1, 2002
PubMed
Summary
This summary is machine-generated.

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Bacterial pathogens activate virulence genes using temperature. Listeria monocytogenes uses an RNA structure in its PrfA mRNA to control gene expression, blocking it at lower temperatures and enabling it at host body temperature.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Bacterial pathogens often regulate virulence gene expression in response to host environmental cues.
  • Host body temperature is a critical signal for the activation of virulence factors in many bacterial species.

Purpose of the Study:

  • To identify the molecular mechanism by which Listeria monocytogenes senses and responds to host body temperature to regulate virulence.
  • To elucidate the role of the virulence-activating transcription factor PrfA in temperature-dependent gene expression.

Main Methods:

  • Analysis of the 5' untranslated region (UTR) of the PrfA mRNA.
  • RNA structure probing and analysis.
  • Reporter assays to measure translation initiation at different temperatures.

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Main Results:

  • A specific RNA stem-loop structure was identified in the 5' UTR of PrfA mRNA.
  • This RNA structure functions as a thermosensor, inhibiting translation initiation at 30°C.
  • The stem-loop structure melts and allows translation initiation at the host body temperature of 37°C.

Conclusions:

  • The thermosensor RNA structure in the PrfA mRNA is a key regulatory element for virulence gene activation in Listeria monocytogenes.
  • Temperature-dependent regulation of PrfA translation is crucial for bacterial adaptation and pathogenesis within the host.