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Electricity-conducting bacterial wire

Architectural insights of proteins that make up the wires might help researchers immobilize metal contaminants or engineer bio-inspired fuel cells

May 31, 2011 Share This!

  • Shewanella oneidensis uses an electron-shuttling conduit made up of proteins to live off of metal in minerals such as this hematite.

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RICHLAND, Wash. – Bacteria called Shewanella can use metal ions in place of oxygen to live and grow. In the process, Shewanella can transform some metals and trap them in minerals, a useful skill for engineers who want to stop radioactive or toxic metals from migrating in soil or groundwater. The bacteria also help cycle metals used as nutrients through the biosphere.

But bacteria can't inhale solid metal like humans breathe oxygen. Instead of lungs, Shewanella send out tiny wires that contact metals and minerals. Within these wires are proteins that pass electrons outward, but no one knows what these proteins look like or how exactly they work together in a large complex. Now, a collaborative research team from the University of East Anglia and Pacific Northwest National Laboratory have determined the structure of the first of these protein components, providing insights into how bacteria live off minerals and rocks.

In addition to cleaning up legacy radioactive waste, the information will help researchers tap bacteria to generate currents in fuel cells or for applications in synthetic biology. Researchers performed some of the work, which they reported in the Proceedings of the National Academy of Sciences' Early Edition, using instruments and expertise at EMSL, the Department of Energy's Environmental Molecular Sciences Laboratory on the PNNL campus.

Read the entire release from the University of East Anglia here.


Reference: Thomas A. Clarke, Marcus J. Edwards, Andrew J. Gates, Andrea Hall, Gaye F. White, Justin Bradley, Catherine Reardon, Liang Shi, Alexander S. Beliaev, Matthew J. Marshall, Zheming Wang, Nicholas J. Watmough, James Fredrickson, John Zachara, Julea N. Butt, and David J. Richardson, Structure of a bacterial cell surface decaheme electron conduit. Proc Natl Acad Sci U S A, Early Edition online the week of May 23-28, 2011. DOI 10.1073/pnas.1017200108, (http://www.pnas.org/content/early/2011/05/16/1017200108).

Tags: Environment, Fundamental Science, Environmental Remediation, Molecular Biology and Biochemistry

EMSL, the Environmental Molecular Sciences Laboratory, is a national scientific user facility sponsored by the Department of Energy's Office of Science.  Located at Pacific Northwest National Laboratory in Richland, Wash., EMSL offers an open, collaborative environment for scientific discovery to researchers around the world. Its integrated computational and experimental resources enable researchers to realize important scientific insights and create new technologies. Follow EMSL on Facebook, LinkedIn and Twitter.

Interdisciplinary teams at Pacific Northwest National Laboratory address many of America's most pressing issues in energy, the environment and national security through advances in basic and applied science. Founded in 1965, PNNL employs 4,300 staff and has an annual budget of more than $1 billion. It is managed by Battelle for the U.S. Department of Energy’s Office of Science. As the single largest supporter of basic research in the physical sciences in the United States, the Office of Science is working to address some of the most pressing challenges of our time. For more information on PNNL, visit the PNNL News Center, or follow PNNL on Facebook, Google+, LinkedIn and Twitter.

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