Dissimilatory Fe(III) Reduction by the Marine Microorganism Desulfuromonas acetoxidans.

摘要: The ability of the marine microorganism Desulfuromonas acetoxidans to reduce Fe(III) was investigated because its close phylogenetic relationship with freshwater dissimilatory reducer Geobacter metallireducens. Washed cell suspensions type strain D. reduced soluble Fe(III)-citrate and complexed nitriloacetic acid. c-type cytochrome(s) oxidized by Mn(IV)-oxalate, as well two electron acceptors known support growth, colloidal sulfur malate. grew in defined anoxic, bicarbonate-buffered medium acetate sole donor poorly crystalline or Mn(IV) acceptor. Magnetite (Fe(3)O(4)) siderite (FeCO(3)) were major end products reduction, whereas rhodochrosite (MnCO(3)) product reduction. Ethanol, propanol, pyruvate, butanol also served donors for In contrast acetoxidans, G. metallireducens could only grow it did not conserve energy growth from S is first shown coupling complete oxidation organic compounds reduction Mn(IV). Thus, provides a model enzymatic mechanism estuarine sediments. These findings demonstrate that 16S rRNA analyses can suggest previously unrecognized metabolic capabilities microorganisms.