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Int J Syst Evol Microbiol 59 (2009), 2880-2883; DOI  10.1099/ijs.0.011080-0
© 2009 International Union of Microbiological Societies

Geoglobus acetivorans sp. nov., an iron(III)-reducing archaeon from a deep-sea hydrothermal vent

G. B. Slobodkina1, T. V. Kolganova2, J. Querellou3, 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 6197, Microbiology of Extreme Environments, Ifremer, Centre de Brest, 29280 Plouzané, France

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

A hyperthermophilic, anaerobic, dissimilatory Fe(III)-reducing, facultatively chemolithoautotrophic archaeon (strain SBH6T) was isolated from a hydrothermal sample collected from the deepest of the known World Ocean hydrothermal fields, Ashadze field (1 ° 58' 21'' N 4 ° 51' 47'' W) on the Mid-Atlantic Ridge, at a depth of 4100 m. The strain was enriched using acetate as the electron donor and Fe(III) oxide as the electron acceptor. Cells of strain SBH6T were irregular cocci, 0.3–0.5 µm in diameter. The temperature range for growth was 50–85 °C, with an optimum at 81 °C. The pH range for growth was 5.0–7.5, with an optimum at pH 6.8. Growth of SBH6T was observed at NaCl concentrations ranging from 1 to 6 % (w/v) with an optimum at 2.5 % (w/v). The isolate utilized acetate, formate, pyruvate, fumarate, malate, propionate, butyrate, succinate, glycerol, stearate, palmitate, peptone and yeast extract as electron donors for Fe(III) reduction. It was also capable of growth with H2 as the sole electron donor, CO2 as a carbon source and Fe(III) as an electron acceptor without the need for organic substances. Fe(III) [in the form of poorly crystalline Fe(III) oxide or Fe(III) citrate] was the only electron acceptor that supported growth. 16S rRNA gene sequence analysis revealed that the closest relative of the isolated organism was Geoglobus ahangari 234T (97.0 %). On the basis of its physiological properties and phylogenetic analyses, the isolate is considered to represent a novel species, for which the name Geoglobus acetivorans sp. nov. is proposed. The type strain is SBH6T (=DSM 21716T =VKM B-2522T).

Abbreviations: AQDS, 9,10-anthraquinone-2,6-disulfonate; DGGE, denaturing gradient gel electrophoresis

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain SBH6T is FJ216404.






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