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Description of “Desulfotomaculum nigrificans subsp. salinus” as a New Species, Desulfotomaculum salinum sp. nov.

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Abstract

This study focused on the physiological, chemotaxonomic, and genotypic characteristics of two thermophilic spore-forming sulfate-reducing bacterial strains, 435T and 781, of which the former has previously been assigned to the subspecies “Desulfotomaculum nigrificans subsp. salinus”. Both strains reduced sulfate with the resulting production of H2S on media supplemented with H2 + CO2, formate, lactate, pyruvate, malate, fumarate, succinate, methanol, ethanol, propanol, butanol, butyrate, valerate, or palmitate. Lactate oxidation resulted in acetate accumulation; butyrate was oxidized completely, with acetate as an intermediate product. Growth on acetate was slow and weak. Sulfate, sulfite, thiosulfate, and elemental sulfur, but not nitrate, served as electron acceptors for growth with lactate. The bacteria performed dismutation of thiosulfate to sulfate and hydrogen sulfide. In the absence of sulfate, pyruvate but not lactate was fermented. Cytochromes of b and c types were present. The temperature and pH optima for both strains were 60–6°C and pH 7.0. Bacteria grew at 0 to 4.5–6.0% NaCl in the medium, with the optimum being at 0.5–1.0%. Phylogenetic analysis based on a comparison of incomplete 16S rRNA sequences revealed that both strains belonged to the C cluster of the genus Desulfotomaculum, exhibiting 95.5–98.3% homology with the previously described species. The level of DNA–DNA hybridization of strains 435T and 781 with each other was 97%, while that with closely related species D. kuznetsovii 17T was 51–52%. Based on the phenotypic and genotypic properties of strains 435T and 781, it is suggested that they be assigned to a new species: Desulfotomaculum salinum sp. nov., comb. nov. (type strain 435T = VKM B 1492T).

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Authors and Affiliations

  1. Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russia

    T. N. Nazina, E. P. Rozanova, E. V. Belyakova, A. M. Lysenko, T. P. Tourova & S. S. Belyaev

  2. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, ul. Vavilova 32, Moscow, GSP-1, 117984, Russia

    A. B. Poltaraus

  3. Academician Yu. Isakov Research Group, Russian Academy of Medical Sciences, Filatov Children's Clinical Hospital no. 13, Moscow, Russia

    G. A. Osipov

Authors
  1. T. N. Nazina
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  2. E. P. Rozanova
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  3. E. V. Belyakova
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  4. A. M. Lysenko
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  5. A. B. Poltaraus
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  6. T. P. Tourova
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  7. G. A. Osipov
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  8. S. S. Belyaev
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Correspondence to T. N. Nazina.

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Translated from Mikrobiologiya, Vol. 74, No. 5, 2005, pp. 654–662.

Original Russian Text Copyright © 2005 by Nazina, Rozanova, Belyakova, Lysenko, Poltaraus, Tourova, Osipov, Belyaev.

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Nazina, T.N., Rozanova, E.P., Belyakova, E.V. et al. Description of “Desulfotomaculum nigrificans subsp. salinus” as a New Species, Desulfotomaculum salinum sp. nov.. Microbiology 74, 567–574 (2005). https://doi.org/10.1007/s11021-005-0104-x

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  • DOI: https://doi.org/10.1007/s11021-005-0104-x

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