Shewanella species are isolated from the oxic/anoxic regions of seawater and aquatic sediments where redox conditions fluctuate in time and space. Colonization of these environments is by virtue of flexible respiratory chains, many of which are notable for the ability to reduce extracellular substrates including the Fe(III) and Mn(IV) contained in oxide and phyllosilicate minerals. Shewanella oneidensis MR-1 serves as a model organism to consider the biochemical basis of this flexibility. In the present paper, we summarize the various systems that serve to branch the respiratory chain of S. oneidensis MR-1 in order that electrons from quinol oxidation can be delivered the various terminal electron acceptors able to support aerobic and anaerobic growth. This serves to highlight several unanswered questions relating to the regulation of respiratory electron transport in Shewanella and the central role(s) of the tetrahaem-containing quinol dehydrogenase CymA in that process.
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December 2012
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Conference Article|
November 21 2012
The roles of CymA in support of the respiratory flexibility of Shewanella oneidensis MR-1
Sophie J. Marritt;
Sophie J. Marritt
*Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K.
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Duncan G.G. McMillan;
Duncan G.G. McMillan
†Institute of Membrane and Systems Biology, Centre for Molecular Nanoscience, School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
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Liang Shi;
Liang Shi
‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, U.S.A.
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James K. Fredrickson;
James K. Fredrickson
‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, U.S.A.
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John M. Zachara;
John M. Zachara
‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, U.S.A.
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David J. Richardson;
David J. Richardson
*Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K.
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Lars J.C. Jeuken;
Lars J.C. Jeuken
†Institute of Membrane and Systems Biology, Centre for Molecular Nanoscience, School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K.
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Julea N. Butt
Julea N. Butt
1
*Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K.
1To whom correspondence should be addressed (emailj.butt@uea.ac.uk).
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Publisher: Portland Press Ltd
Received:
June 14 2012
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© 2012 The Authors Journal
2012
Biochem Soc Trans (2012) 40 (6): 1217–1221.
Article history
Received:
June 14 2012
Citation
Sophie J. Marritt, Duncan G.G. McMillan, Liang Shi, James K. Fredrickson, John M. Zachara, David J. Richardson, Lars J.C. Jeuken, Julea N. Butt; The roles of CymA in support of the respiratory flexibility of Shewanella oneidensis MR-1. Biochem Soc Trans 1 December 2012; 40 (6): 1217–1221. doi: https://doi.org/10.1042/BST20120150
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