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Int J Syst Evol Microbiol 58 (2008), 852-855; DOI  10.1099/ijs.0.65485-0
© 2008 International Union of Microbiological Societies

Clostridium tepidiprofundi sp. nov., a moderately thermophilic bacterium from a deep-sea hydrothermal vent

G. B. Slobodkina1, T. V. Kolganova2, T. P. Tourova1, N. A. Kostrikina1, C. Jeanthon3, E. A. Bonch-Osmolovskaya1 and A. I. Slobodkin1

1 Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, 117312 Moscow, Russia
2 Bioengineering Center, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/1, 117312 Moscow, Russia
3 UMR 7144, Adaptation et Diversité en Milieu Marin (AD2M), CNRS and Université Pierre and Marie Curie, Place Georges Teissier, 29682 Roscoff Cedex, France

Correspondence
G. B. Slobodkina
gslobodkina{at}mail.ru

A moderately thermophilic, anaerobic bacterium (strain SG 508T) was isolated from a hydrothermal vent chimney located at 1 ° N on the East Pacific Rise at a depth of 2650 m. Cells of strain SG 508T were straight to slightly curved rods, 0.4–0.6 µm in diameter and 2.0–3.0 µm in length. Spore formation was observed only below pH 5.5. The temperature range for growth was 22–60 °C, with optimum growth at 50 °C. The pH range for growth was 4.0–8.5, with optimum growth at pH 6.0–6.8. Growth of strain SG 508T was observed at NaCl concentrations ranging from 1.0 to 6.0 % (w/v), with optimum growth at 2.5 % (w/v). Substrates utilized by strain SG 508T included casein, peptone, tryptone, yeast extract, beef extract, starch, maltose and glucose. The products of glucose fermentation were ethanol, acetate, H2, formate and CO2. Strain SG 508T was able to reduce elemental sulfur to hydrogen sulfide. The DNA G+C content of strain SG 508T was 30.9 mol%. 16S rRNA gene sequence analysis revealed that the isolated organism belonged to cluster I of the genus Clostridium. On the basis of its physiological properties and data from phylogenetic analyses, strain SG 508T is considered to represent a novel species of the genus Clostridium, for which the name Clostridium tepidiprofundi sp. nov. is proposed. The type strain is SG 508T (=DSM 19306T =VKM B-2459T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of SG 508T is EF197795.






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