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

Author:

Bretschger Orianna1,Obraztsova Anna2,Sturm Carter A.3,Chang In Seop45,Gorby Yuri A.6,Reed Samantha B.7,Culley David E.7,Reardon Catherine L.7,Barua Soumitra89,Romine Margaret F.7,Zhou Jizhong89,Beliaev Alexander S.7,Bouhenni Rachida10,Saffarini Daad10,Mansfeld Florian1,Kim Byung-Hong25,Fredrickson James K.7,Nealson Kenneth H.2

Affiliation:

1. Mork Family Department of Chemical Engineering and Materials Science

2. Department of Earth Sciences, University of Southern California, Los Angeles, California

3. Department of Earth Sciences, Rice University, Houston, Texas

4. Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea

5. Korea Institute of Science and Technology, Seoul, Korea

6. The J. Craig Venter Institute, La Jolla, California

7. Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington

8. Institute for Environmental Genomics, Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma

9. Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee

10. Department of Biological Sciences, University of Wisconsin—Milwaukee, Milwaukee, Wisconsin

Abstract

ABSTRACT 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.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

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