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Current Production and Metal Oxide Reduction by Shewanella oneidensis MR-1 Wild Type and Mutants ^,

Mork Family Department of Chemical Engineering and Materials Science,¹ Department of Earth Sciences, University of Southern California, Los Angeles, California,² Department of Earth Sciences, Rice University, Houston, Texas,³ Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea,⁴ The J. Craig Venter Institute, La Jolla, California,⁵ Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington,⁶ Institute for Environmental Genomics, Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma,⁷ Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee,⁸ Department of Biological Sciences, University of Wisconsin—Milwaukee, Milwaukee, Wisconsin,⁹ Korea Institute of Science and Technology, Seoul, Korea,¹⁰

Received 15 May 2007/ Accepted 13 July 2007

Shewanella oneidensis MR-1 is a gram-negative facultative anaerobe capable of utilizing a broad range of electron acceptors, including several solid substrates. S. oneidensis MR-1 can reduce Mn(IV) and Fe(III) oxides and can produce current in microbial fuel cells. The mechanisms that are employed by S. oneidensis MR-1 to execute these processes have not yet been fully elucidated. Several different S. oneidensis MR-1 deletion mutants were generated and tested for current production and metal oxide reduction. The results showed that a few key cytochromes play a role in all of the processes but that their degrees of participation in each process are very different. Overall, these data suggest a very complex picture of electron transfer to solid and soluble substrates by S. oneidensis MR-1.

Published ahead of print on 20 July 2007.

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