Mechanisms for the Reduction of Actinides and Tc(VII) in Geobacter sulfurreducens

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The mechanism of the reduction of U(VI) and Cr(VI) has now been studied in detail. Cr(VI) is reduced by one-electron transfer reactions to Cr(III), via a cell-bound Cr(V) intermediate identified by EPR spectroscopy. Studies with a cytochrome c7 mutant demonstrate that the electron transfer chain includes this protein which may be the terminal reductase for Cr(VI). Potential mechanisms of inhibition of Cr(III) precipitation, involving complex formation with organic acids commonly used as electron donors for metal reduction in the subsurface have also been identified. We have also initiated a collaboration with computational chemists led by Prof Ian Hillier in Manchester, ... continued below

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Lloyd, Jonathan R. June 1, 2004.

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The mechanism of the reduction of U(VI) and Cr(VI) has now been studied in detail. Cr(VI) is reduced by one-electron transfer reactions to Cr(III), via a cell-bound Cr(V) intermediate identified by EPR spectroscopy. Studies with a cytochrome c7 mutant demonstrate that the electron transfer chain includes this protein which may be the terminal reductase for Cr(VI). Potential mechanisms of inhibition of Cr(III) precipitation, involving complex formation with organic acids commonly used as electron donors for metal reduction in the subsurface have also been identified. We have also initiated a collaboration with computational chemists led by Prof Ian Hillier in Manchester, to model metal binding to cytochrome c7, and subsequent electron transfer from the enzyme to the metal quantum mechanically.

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  • Report No.: NABIR-1019572-2004
  • Grant Number: None
  • DOI: 10.2172/893683 | External Link
  • Office of Scientific & Technical Information Report Number: 893683
  • Archival Resource Key: ark:/67531/metadc883312

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  • June 1, 2004

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 4, 2016, 2:41 p.m.

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Lloyd, Jonathan R. Mechanisms for the Reduction of Actinides and Tc(VII) in Geobacter sulfurreducens, report, June 1, 2004; United States. (digital.library.unt.edu/ark:/67531/metadc883312/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.