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Applied and Environmental Microbiology, March 2004, p. 1865-1868, Vol. 70, No. 3
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.3.1865-1868.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Arsenite-Oxidizing Hydrogenobaculum Strain Isolated from an Acid-Sulfate-Chloride Geothermal Spring in Yellowstone National Park

Jessica Donahoe-Christiansen, Seth D'Imperio, Colin R. Jackson, William P. Inskeep,* and Timothy R. McDermott*

Thermal Biology Institute and Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana 59717

Received 13 June 2003/ Accepted 12 December 2003

An arsenite-oxidizing Hydrogenobaculum strain was isolated from a geothermal spring in Yellowstone National Park, Wyo., that was previously shown to contain microbial populations engaged in arsenite oxidation. The isolate was sensitive to both arsenite and arsenate and behaved as an obligate chemolithoautotroph that used H2 as its sole energy source and had an optimum temperature of 55 to 60°C and an optimum pH of 3.0. The arsenite oxidation in this organism displayed saturation kinetics and was strongly inhibited by H2S.

* Corresponding author. Mailing address: Thermal Biology Institute, Montana State University, Bozeman, MT 59717. Phone: (406) 994-2190. Fax: (406) 994-3933. E-mail for Timothy R. McDermott: timmcder{at}montana.edu. E-mail for William P. Inskeep: binskeep{at}montana.edu.

Applied and Environmental Microbiology, March 2004, p. 1865-1868, Vol. 70, No. 3
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.3.1865-1868.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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