Document Detail


Aerotaxis and other energy-sensing behavior in bacteria.
MedLine Citation:
PMID:  10547687     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Energy taxis is widespread in motile bacteria and in some species is the only known behavioral response. The bacteria monitor their cellular energy levels and respond to a decrease in energy by swimming to a microenvironment that reenergizes the cells. This is in contrast to classical Escherichia coli chemotaxis in which sensing of stimuli is independent of cellular metabolism. Energy taxis encompasses aerotaxis (taxis to oxygen), phototaxis, redox taxis, taxis to alternative electron acceptors, and chemotaxis to a carbon source. All of these responses share a common signal transduction pathway. An environmental stimulus, such as oxygen concentration or light intensity, modulates the flow of reducing equivalents through the electron transport system. A transducer senses the change in electron transport, or possibly a related parameter such as proton motive force, and initiates a signal that alters the direction of swimming. The Aer and Tsr proteins in E. coli are newly recognized transducers for energy taxis. Aer is homologous to E. coli chemoreceptors but unique in having a PAS domain and a flavin-adenine dinucleotide cofactor that is postulated to interact with a component of the electron transport system. PAS domains are energy-sensing modules that are found in proteins from archaea to humans. Tsr, the serine chemoreceptor, is an independent transducer for energy taxis, but its sensory mechanism is unknown. Energy taxis has a significant ecological role in vertical stratification of microorganisms in microbial mats and water columns. It plays a central role in the behavior of magnetotactic bacteria and also appears to be important in plant-microbe interactions.
Authors:
B L Taylor; I B Zhulin; M S Johnson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Annual review of microbiology     Volume:  53     ISSN:  0066-4227     ISO Abbreviation:  Annu. Rev. Microbiol.     Publication Date:  1999  
Date Detail:
Created Date:  1999-12-06     Completed Date:  1999-12-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0372370     Medline TA:  Annu Rev Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  103-28     Citation Subset:  IM; S    
Affiliation:
Department of Microbiology and Molecular Genetics, School of Medicine, Loma Linda University, California 92350, USA. blTaylor@som.llu.edu
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MeSH Terms
Descriptor/Qualifier:
Bacterial Physiological Phenomena*
Chemotaxis / physiology
Energy Metabolism
Escherichia coli / physiology
Movement / physiology
Oxygen / physiology*
Signal Transduction
Chemical
Reg. No./Substance:
7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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