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Thermosensing function of the Escherichia coli redox sensor Aer
So-ichiro Nishiyama1, Shinji Ohno, Noriko Ohta
1Department of Frontier Bioscience, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan.
Journal of Bacteriology
|January 26, 2010
Summary
Escherichia coli chemoreceptors sense temperature changes for thermotaxis. The aerotaxis transducer Aer, a chemoreceptor homolog, also mediates these thermoresponses, suggesting conserved thermosensing mechanisms.
Area of Science:
- Microbiology
- Cellular Biology
- Biophysics
Background:
- Escherichia coli utilizes chemoreceptors for chemotaxis, sensing chemical gradients.
- Thermotaxis, the ability to sense temperature changes, is crucial for bacterial survival and motility.
- The precise mechanisms of thermosensing in bacteria are not fully elucidated.
Purpose of the Study:
- To investigate the role of the aerotaxis transducer (Aer) in bacterial thermosensing.
- To explore whether chemoreceptor homologs lacking periplasmic domains can mediate thermoresponses.
- To propose a general model for thermosensing in Escherichia coli chemoreceptors.
Main Methods:
- Utilized genetic analysis of Escherichia coli.
- Investigated the function of the aerotaxis transducer (Aer) in response to temperature stimuli.
- Compared the thermosensing capabilities of Aer with known chemoreceptors.
Main Results:
- Identified the aerotaxis transducer Aer as a mediator of thermoresponses in Escherichia coli.
- Demonstrated that Aer, a chemoreceptor homolog lacking a periplasmic domain, is involved in sensing temperature changes.
- Provided evidence that thermosensing is a general attribute of conserved domains within chemoreceptors.
Conclusions:
- The aerotaxis transducer Aer plays a significant role in bacterial thermotaxis.
- Thermosensing is not limited to chemoreceptors with periplasmic domains.
- Conserved cytoplasmic or transmembrane domains are likely responsible for thermosensing in Escherichia coli.
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