Carboxydothermus islandicus sp. nov., a thermophilic, hydrogenogenic, carboxydotrophic bacterium isolated from a hot spring

DOI Web Site 3 Citations
  • Andrey A. Novikov
    Gubkin Russian State University of Oil and Gas, Leninskiy Prospect 65, 117485 Moscow, Russia
  • Tatyana G. Sokolova
    Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60 Let Oktyabrya 7/2, 117312 Moscow, Russia
  • Alexander V. Lebedinsky
    Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60 Let Oktyabrya 7/2, 117312 Moscow, Russia
  • Tatyana V. Kolganova
    Bioengineering Center, Russian Academy of Sciences, Prospect 60 Let Oktyabrya 7/1, 117312 Moscow, Russia
  • Elizaveta A. Bonch-Osmolovskaya
    Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60 Let Oktyabrya 7/2, 117312 Moscow, Russia

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Description

<jats:p>An anaerobic, thermophilic bacterium, strain SET IS-9<jats:sup>T</jats:sup>, was isolated from an Icelandic hot spring. Cells of strain SET IS-9<jats:sup>T</jats:sup>are short, slightly curved, motile rods. The strain grows chemolithotrophically on CO, producing equimolar quantities of H<jats:sub>2</jats:sub>and CO<jats:sub>2</jats:sub>. It also grows fermentatively on lactate or pyruvate in the presence of yeast extract (0.2 g l<jats:sup>−1</jats:sup>). Products of pyruvate fermentation are acetate, CO<jats:sub>2</jats:sub>and H<jats:sub>2</jats:sub>. Growth occurs at 50–70 °C, with an optimum at 65 °C, and at pH 5.0–8.0, with an optimum at pH 5.5–6.0. The generation time during chemolithotrophic growth on CO under optimal conditions is 2.0 h. 16S rRNA gene sequence analysis suggested that the organism belongs to the genus<jats:italic>Carboxydothermus</jats:italic>. On the basis of phenotypic features and phylogenetic analysis,<jats:italic>Carboxydothermus islandicus</jats:italic>sp. nov. is proposed, with the type strain SET IS-9<jats:sup>T</jats:sup>( = DSM 21830<jats:sup>T</jats:sup> = VKM B-2561<jats:sup>T</jats:sup>). An emended description of the genus<jats:italic>Carboxydothermus</jats:italic>is also given.</jats:p>

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