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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
Published on: February 19, 2019
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RNA thermoswitches modulate Staphylococcus aureus adaptation to ambient temperatures
Arancha Catalan-Moreno1, Marta Cela1, Pilar Menendez-Gil1
1Instituto de Agrobiotecnología, IdAB, CSIC-Gobierno de Navarra, Avda. de Pamplona 123, 31192 Mutilva, Navarra, Spain.
Nucleic Acids Research
|March 4, 2021
Summary
Staphylococcus aureus cold shock proteins CspB and CspC production is regulated by RNA thermoswitches. These thermoswitches control bacterial adaptation to environmental temperature changes, crucial for host-to-environment transitions.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Pathogenesis
Background:
- Thermoregulation of bacterial virulence genes is critical for pathogen survival and host colonization.
- Mechanisms of cold adaptation in bacteria outside the host are not fully understood.
Purpose of the Study:
- To investigate the regulatory mechanisms controlling cold shock protein production in Staphylococcus aureus.
- To elucidate the role of RNA thermoswitches in bacterial temperature adaptation.
Main Methods:
- In silico prediction
- Enzymatic probing
- Site-directed mutagenesis
- Analysis of mRNA structures and translation
Main Results:
- Identified two paralogous RNA thermoswitches controlling CspB and CspC production in S. aureus.
- Demonstrated temperature-dependent structural rearrangements in cspB and cspC 5'UTRs, affecting ribosome binding site accessibility.
- Showed that CspA can promote a conformation repressing CspB/CspC production at host temperatures (37°C).
- Deletion of cspB/cspC or their thermoswitches impaired bacterial growth at ambient temperatures.
Conclusions:
- RNA thermoswitches are key regulators of CspB and CspC production in S. aureus, enabling adaptation to environmental temperature shifts.
- This thermoregulation is vital for S. aureus survival and growth during transitions from host to environment.
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