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Journal of Bacteriology, July 2005, p. 5049-5053, Vol. 187, No. 14
0021-9193/05/$08.00+0     doi:10.1128/JB.187.14.5049-5053.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Chemotactic Responses to Metals and Anaerobic Electron Acceptors in Shewanella oneidensis MR-1

Sira Bencharit and Mandy J. Ward*

Department of Geography and Environmental Engineering, The Johns Hopkins University, 3400 N. Charles St., Baltimore, Maryland 21218

Received 25 February 2005/ Accepted 8 April 2005

Although a previous study indicated that the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1 lacks chemotactic responses to metals that can be used as anaerobic electron acceptors, new results show that this bacterium responds to both Mn(III) and Fe(III). Cells were also shown to respond to another unusual electron acceptor, the humic acid analog anthraquinone-2,6-disulfonate. These results indicate that S. oneidensis is capable of moving towards a number of unusual anaerobic electron acceptors, including some that would normally be insoluble in the environment. Additionally, S. oneidensis was shown to migrate in gradients of several divalent cations under anaerobic conditions. Although responses to the reduced forms of redox-active metals, such as Mn(II) and Fe(II), might indicate that S. oneidensis uses gradients of these metals to locate the insoluble electron acceptors Mn(III/IV) and Fe(III) for dissimilatory purposes, responses to non-redox-active metals, such as Zn(II), suggest that movement towards divalent cations might serve other, potentially assimilatory, purposes.

* Corresponding author. Mailing address: Department of Geography and Environmental Engineering, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218. Phone: (410) 516-4201. Fax: (410) 516-8996. E-mail: mjward{at}jhu.edu.

Journal of Bacteriology, July 2005, p. 5049-5053, Vol. 187, No. 14
0021-9193/05/$08.00+0     doi:10.1128/JB.187.14.5049-5053.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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