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The Periplasmic 9.6-Kilodalton C-Type Cytochrome Of Geobacter Sulfurreducens Is Not An Electron Shuttle To Fe(III)

Jon R. Lloyd, Elizabeth L. Blunt-Harris, Derek R. Lovley

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ABSTRACTGeobacter sulfurreducenscontains a 9.6-kDac-type cytochrome that was previously proposed to serve as an extracellular electron shuttle to insoluble Fe(III) oxides. However, when the cytochrome was added to washed-cell suspensions ofG. sulfurreducensit did not enhance Fe(III) oxide reduction, whereas similar concentrations of the known electron shuttle, anthraquinone-2,6-disulfonate, greatly stimulated Fe(III) oxide reduction. Furthermore, analysis of the extracellularc-type cytochromes in cultures ofG. sulfurreducensdemonstrated that the dominantc-type cytochrome was not the 9.6-kDa cytochrome, but rather a 41-kDa cytochrome. These results and other considerations suggest that the 9.6-kDa cytochrome is not an important extracellular electron shuttle to Fe(III) oxides.