How a Protein Senses Temperature Changes in Listeria
Author Information
Author(s): Heather D. Kamp, Darren E. Higgins
Primary Institution: Harvard Medical School
Hypothesis
GmaR functions as a protein thermometer that controls temperature-dependent transcription of flagellar motility genes in Listeria monocytogenes.
Conclusion
GmaR is a thermo-sensing anti-repressor that regulates flagellar motility gene transcription in response to temperature changes.
Supporting Evidence
- GmaR undergoes a temperature-dependent conformational change that affects its interaction with the MogR repressor.
- The MogR:GmaR complex is more stable at lower temperatures, allowing for flagellar motility gene transcription.
- At physiological temperatures, GmaR is degraded more rapidly, leading to repression of flagellar motility genes.
Takeaway
This study found that a protein called GmaR helps bacteria know when to turn their flagella on or off based on temperature, which is important for their survival.
Methodology
The study used two-hybrid assays, gel mobility shift analyses, and circular dichroism to investigate the interactions and conformational changes of GmaR.
Limitations
The study was conducted under in vitro conditions, which may not fully replicate the in vivo environment of Listeria monocytogenes.
Digital Object Identifier (DOI)
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