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Applied and Environmental Microbiology, April 2005, p. 2186-2189, Vol. 71, No. 4
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.4.2186-2189.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Evidence for Involvement of an Electron Shuttle in Electricity Generation by Geothrix fermentans

Daniel R. Bond* and Derek R. Lovley

Department of Microbiology, University of Massachusetts, Amherst, Massachusetts

Received 6 August 2004/ Accepted 4 November 2004

In experiments performed using graphite electrodes poised by a potentiostat (+200 mV versus Ag/AgCl) or in a microbial fuel cell (with oxygen as the electron acceptor), the Fe(III)-reducing organism Geothrix fermentans conserved energy to support growth by coupling the complete oxidation of acetate to reduction of a graphite electrode. Other organic compounds, such as lactate, malate, propionate, and succinate as well as components of peptone and yeast extract, were utilized for electricity production. However, electrical characteristics and the results of shuttling assays indicated that unlike previously described electrode-reducing microorganisms, G. fermentans produced a compound that promoted electrode reduction. This is the first report of complete oxidation of organic compounds linked to electrode reduction by an isolate outside of the Proteobacteria.

* Corresponding author. Present address: Department of Microbiology and BioTechnology Institute, University of Minnesota, 140 Gortner, 1479 Gortner Ave., St. Paul, MN 55108. Phone: (612) 624-8619. Fax: (612) 625-1700. E-mail: dbond{at}umn.edu.

Applied and Environmental Microbiology, April 2005, p. 2186-2189, Vol. 71, No. 4
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.4.2186-2189.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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