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A globin-coupled oxygen sensor from the facultatively alkaliphilic Bacillus halodurans C-125
1Department of Microbiology, Snyder Hall 207, 2538 The Mall, University of Hawaii, Honolulu, Hawaii 96822, USA.
Extremophiles : Life Under Extreme Conditions
|November 9, 2001
Summary
Researchers discovered novel oxygen sensors in bacteria and archaea. These globin-coupled sensors (GCS) trigger aerotactic responses, expanding our understanding of microbial oxygen sensing.
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Heme-containing signal transducers, HemAT-Hs and HemAT-Bs, were identified in Halobacterium salinarum and Bacillus subtilis.
- These proteins bind oxygen and mediate aerotactic responses.
Purpose of the Study:
- To investigate the oxygen-sensing mechanism in Bacillus halodurans.
- To identify and characterize novel oxygen sensors using the globin-coupled sensor (GCS) motif.
Main Methods:
- Bioinformatic prediction of GCS motif in Bacillus halodurans.
- Cloning, expression, and purification of the GCS(Bh) protein.
- Spectral analysis of purified GCS(Bh).
Main Results:
- A protein in Bacillus halodurans, annotated as a methyl-accepting chemotaxis protein (MCP), was predicted to be a GCS oxygen sensor.
- Purified GCS(Bh) binds heme and exhibits myoglobin-like spectra.
- These findings indicate GCS(Bh) functions as an oxygen sensor.
Conclusions:
- Globin-coupled sensor (GCS) motif is a novel oxygen-sensing domain.
- GCS(Bh) acts as an oxygen sensor in Bacillus halodurans, transmitting signals for aerotaxis.
- This discovery expands the known repertoire of microbial oxygen sensors beyond PAS domain transducers.
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