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Desulfosporosinus lacus sp. nov., a sulfate-reducing bacterium isolated from pristine freshwater lake sediments

¹ Division of Biological Sciences, Program in Microbial Ecology, University of Montana, Missoula, MT 59812-4824, USA
² Institut für Chemie und Biologie des Meeres, Universität Oldenburg, D-26111 Oldenburg, Germany
³ Department of Geology, University of Montana, Missoula, MT 59812, USA
⁴ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany
⁵ Section Microbiology, Department Biology I, Ludwig-Maximilians-Universität München, Maria-Ward-Str. 1a, D-80638 München, Germany

Correspondence
R. F. Rosenzweig
Frank.Rosenzweig{at}mso.umt.edu

A novel sulfate-reducing bacterium was isolated from pristine sediments of Lake Stechlin, Germany. This strain, STP12^T, was found to contain predominantly c-type cytochromes and to reduce sulfate, sulfite and thiosulfate using lactate as an electron donor. Although STP12^T could not utilize elemental sulfur as an electron acceptor, it could support growth by dissimilatory Fe(III) reduction. In a comparison of 16S rRNA gene sequences, STP12^T was 96.7 % similar to Desulfosporosinus auripigmenti DSM 13351^T, 96.5 % similar to Desulfosporosinus meridiei DSM 13257^T and 96.4 % similar to Desulfosporosinus orientis DSM 765^T. DNA–DNA hybridization experiments revealed that strain STP12^T shows only 32 % reassociation with the type strain of the type species of the genus, D. orientis DSM 765^T. These data, considered in conjunction with strain-specific differences in heavy metal tolerance, cell-wall chemotaxonomy and riboprint patterns, support recognition of strain STP12^T (=DSM 15449^T=JCM 12239^T) as the type strain of a distinct and novel species within the genus Desulfosporosinus, Desulfosporosinus lacus sp. nov.

A transmission electron micrograph of cells of strain STP12^T, a graph showing lactate oxidation and growth and a summary of the metal-tolerance profiles of strain STP12^T and related strains are available as supplementary material in IJSEM Online.

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