The in situ stimulation of metal reduction by Geobacter bacteria leads to the concomitant precipitation of U(VI) from groundwater. However, the biological mechanism behind this reaction has remained elusive for almost two decades. We used a combination of in vivo (molecular and biochemical) and in vitro (biomimetic interfaces) approaches to identify the components of the uranium reductase system of Geobacter spp. The results demonstrate a previously unrecognized role for Geobacter conductive pili in the extracellular reduction of uranium and highlight its essential function as a catalytic and protective cellular mechanism. Findings from this research provide fundamental mechanistic understanding needed to design effective in situ bioremediation strategies and the tools to develop deployable nanodevices for efficient contaminant immobilization and removal.

Microbial nanointerfaces for uranium bioremediation

246th National Meeting (2013)

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