Role of humic-bound iron as an electron transfer agent in dissimilatory Fe(III) reduction.
The dissimilatory Fe(III) reducer Geobacter metallireducens reduced Fe(III) bound in humic substances, but the concentrations of Fe(III) in a wide range of highly purified humic substances were too low to account for a significant portion of the electron-accepting capacities of the humic substances. Furthermore, once reduced, the iron in humic substances could not transfer electrons to Fe(III) oxide. These results suggest that other electron-accepting moieties in humic substances, such as quinones, are the important electron-accepting and shuttling agents under Fe(III)-reducing conditions.
Lovley
D R
DR
Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01337, USA. dlovley@microbio.umass.edu
Blunt-Harris
E L
EL
D020564:Deltaproteobacteria / Q000378:metabolism*; D004579:Electron Transport; D005290:Ferric Compounds / Q000378:metabolism*; D006812:Humic Substances / Q000737:chemistry / Q000378:metabolism*; D007501:Iron / Q000378:metabolism*; D010084:Oxidation-Reduction
D005290:Ferric Compounds; D006812:Humic Substances; D007501:Iron