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Applied and Environmental Microbiology, December 2001, p. 5568-5580, Vol. 67, No. 12
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.12.5568-5580.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Isolation and Characterization of a Novel As(V)-Reducing Bacterium: Implications for Arsenic Mobilization and the Genus Desulfitobacterium

Allison Niggemyer,1,dagger Stefan Spring,2 Erko Stackebrandt,2 and R. Frank Rosenzweig3,*

Program in Environmental Science, University of Idaho, Moscow, Idaho 83844,1 Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, Florida 32610-0266,3 and Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany2

Received 12 June 2001/Accepted 27 September 2001

Dissimilatory arsenate-reducing bacteria have been implicated in the mobilization of arsenic from arsenic-enriched sediments. An As(V)-reducing bacterium, designated strain GBFH, was isolated from arsenic-contaminated sediments of Lake Coeur d'Alene, Idaho. Strain GBFH couples the oxidation of formate to the reduction of As(V) when formate is supplied as the sole carbon source and electron donor. Additionally, strain GBFH is capable of reducing As(V), Fe(III), Se(VI), Mn(IV) and a variety of oxidized sulfur species. 16S ribosomal DNA sequence comparisons reveal that strain GBFH is closely related to Desulfitobacterium hafniense DCB-2T and Desulfitobacterium frappieri PCP-1T. Comparative physiology demonstrates that D. hafniense and D. frappieri, known for reductively dechlorinating chlorophenols, are also capable of toxic metal or metalloid respiration. DNA-DNA hybridization and comparative physiological studies suggest that D. hafniense, D. frappieri, and strain GBFH should be united into one species. The isolation of an Fe(III)- and As(V)-reducing bacterium from Lake Coeur d'Alene suggests a mechanism for arsenic mobilization in these contaminated sediments while the discovery of metal or metalloid respiration in the genus Desulfitobacterium has implications for environments cocontaminated with arsenious and chlorophenolic compounds.

* Corresponding author. Mailing address: Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, FL 32610-0266. Phone: (352) 392-6463. Fax: (352) 392-3133. E-mail: rrosenzw{at}mgm.ufl.edu.

dagger Present address: Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, FL 32610-0266.

Applied and Environmental Microbiology, December 2001, p. 5568-5580, Vol. 67, No. 12
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.12.5568-5580.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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