How do bacteria avoid high oxygen concentrations?
Bacteria, such as Escherichia coli and Azospirillum brasilense, avoid microenvironments with elevated oxygen concentrations, not by sensing reactive oxygen derivatives, but by sensing a metabolic down-shift that results from elevated oxygen levels. A novel protein, Aer, and the chemotaxis serine receptor, Tsr, have recently been identified as transducers for aerotaxis which monitor internal energy levels in the bacteria.
Zhulin
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Department of Microbiology and Molecular Genetics, School of Medicine, Loma Linda University, California 92350, USA.
Johnson
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Taylor
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D018407:Bacterial Physiological Phenomena; D001692:Biological Transport; D002633:Chemotaxis; D004583:Electrons; D008954:Models, Biological; D010100:Oxygen / Q000378:metabolism*; D011522:Protons; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction
D011522:Protons; D017382:Reactive Oxygen Species; D010100:Oxygen