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Int J Syst Evol Microbiol 57 (2007), 98-102; DOI  10.1099/ijs.0.64655-0
© 2007 International Union of Microbiological Societies

Desulfovirgula thermocuniculi gen. nov., sp. nov., a thermophilic sulfate-reducer isolated from a geothermal underground mine in Japan

Anna H. Kaksonen1, Stefan Spring2, Peter Schumann2, Reiner M. Kroppenstedt2 and Jaakko A. Puhakka1

1 Institute of Environmental Engineering and Biotechnology, Tampere University of Technology, Tampere, Finland
2 DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany

Correspondence
Anna H. Kaksonen
anna.kaksonen{at}tut.fi

A thermophilic, Gram-positive, endospore-forming, sulfate-reducing bacterial strain, designated RL80JIVT, was isolated from a geothermally active underground mine in Japan. Cells were rod-shaped and motile. The temperature and pH ranges for growth were 61–80 °C (optimum at 69–72 °C) and pH 6.4–7.9 (optimum at pH 6.8–7.3), and the strain tolerated up to 0.5 % NaCl. Strain RL80JIVT utilized sulfate, sulfite, thiosulfate and elemental sulfur as electron acceptors. Electron donors utilized were H2 in the presence of CO2, and carboxylic acids. Fermentative growth occurred on lactate and pyruvate. The cell wall contained meso-diaminopimelic acid and the major respiratory isoprenoid quinone was menaquinone MK-7. Major whole-cell fatty acids were iso-C15 : 0, iso-C17 : 0 and C16 : 0. Strain RL80JIVT was found to be affiliated with the thiosulfate-reducer Thermanaeromonas toyohensis DSM 14490T (90.9 % 16S rRNA gene sequence similarity) and with the sulfate-reducer Desulfotomaculum thermocisternum DSM 10259T (90.0 % similarity). Strain RL80JIVT is therefore considered to represent a novel species of a new genus, for which the name Desulfovirgula thermocuniculi gen. nov., sp. nov. is proposed. The type strain of Desulfovirgula thermocuniculi is RL80JIVT (=DSM 16036T=JCM 13928T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain RL80JIVT is DQ208689.




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A. H. Kaksonen, S. Spring, P. Schumann, R. M. Kroppenstedt, and J. A. Puhakka
Desulfurispora thermophila gen. nov., sp. nov., a thermophilic, spore-forming sulfate-reducer isolated from a sulfidogenic fluidized-bed reactor
Int J Syst Evol Microbiol, May 1, 2007; 57(5): 1089 - 1094.
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