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Applied and Environmental Microbiology, April 2009, p. 1950-1960, Vol. 75, No. 7
0099-2240/09/$08.00+0     doi:10.1128/AEM.02614-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Ecophysiology of "Halarsenatibacter silvermanii" Strain SLAS-1^T, gen. nov., sp. nov., a Facultative Chemoautotrophic Arsenate Respirer from Salt-Saturated Searles Lake, California ^,

Jodi Switzer Blum,¹ Sukkyun Han,² Brian Lanoil,³ Chad Saltikov,⁴ Brian Witte,⁵ F. Robert Tabita,⁵ Sean Langley,⁶ Terry J. Beveridge,^7, Linda Jahnke,⁸ and Ronald S. Oremland^1*

U.S. Geological Survey, Menlo Park, California 94025,¹ Department of Environmental Sciences, University of California, Riverside, California 92521,² Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E1, Canada,³ Department of Microbiology and Environmental Toxicology, University of California, Santa Cruz, California 95064,⁴ Department of Microbiology, The Ohio State University, Columbus, Ohio 43210,⁵ Department of Earth Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada,⁶ Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada,⁷ NASA Ames Research Center, Moffett Field, California 94035⁸

Received 14 November 2008/ Accepted 2 February 2009

Searles Lake occupies a closed basin harboring salt-saturated, alkaline brines that have exceptionally high concentrations of arsenic oxyanions. Strain SLAS-1^T was previously isolated from Searles Lake (R. S. Oremland, T. R. Kulp, J. Switzer Blum, S. E. Hoeft, S. Baesman, L. G. Miller, and J. F. Stolz, Science 308:1305-1308, 2005). We now describe this extremophile with regard to its substrate affinities, its unusual mode of motility, sequenced arrABD gene cluster, cell envelope lipids, and its phylogenetic alignment within the order Halanaerobacteriales, assigning it the name "Halarsenatibacter silvermanii" strain SLAS-1^T. We also report on the substrate dynamics of an anaerobic enrichment culture obtained from Searles Lake that grows under conditions of salt saturation and whose members include a novel sulfate reducer of the order Desulfovibriales, the archaeon Halorhabdus utahensis, as well as a close homolog of strain SLAS-1^T.

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* Corresponding author. Mailing address: U.S. Geological Survey, MS 480, 345 Middlefield Rd., Menlo Park, CA 94025. Phone: (650) 329-4482. Fax: (650) 329-4463. E-mail: roremlan{at}usgs.gov

Published ahead of print on 13 February 2009.

Supplemental material for this article may be found at http://aem.asm.org/.

Deceased.

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Applied and Environmental Microbiology, April 2009, p. 1950-1960, Vol. 75, No. 7
0099-2240/09/$08.00+0     doi:10.1128/AEM.02614-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.