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Geoalkalibacter ferrihydriticus gen. nov. sp. nov., the first alkaliphilic representative of the family Geobacteraceae, isolated from a soda lake

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Abstract

Investigation of iron reduction in bottom sediments of alkaline soda lakes resulted in the isolation of a new obligately anaerobic iron-reducing bacterium, strain Z-0531, from Lake Khadyn (Tuva, Russia) sediment samples. The cells of strain Z-0531 are short (1.0–1.5 by 0.3–0.5 µm), motile, non-spore-forming, gram-negative rods. The isolate is an obligate alkaliphile, developing in the pH range of 7.8–10.0, with an optimum at pH 8.6. It does not require NaCl but grows at NaCl concentrations of 0–50 g/l. It can oxidize acetate with such electron acceptors as amorphous Fe(III) hydroxide (AFH), EDTA-Fe(III), anthraquinone-2,6-disulfonate (quinone), Mn(IV), and S0. On medium with EDTA-Fe(III), the isolate can oxidize, apart from acetate, ethanol, pyruvate, oxalate, arginine, tartrate, lactate, propionate, and serine. H2 is not utilized. The reduced products formed during growth with AFH are siderite or magnetite, depending on the growth conditions. The isolate is incapable of fermenting sugars, peptides, and amino acids. Yeast extract or vitamins are required as growth factors. The organism is capable of dinitrogen fixation and harbors the nifH gene. The DNA G+C content is 55.3 mol %. 16S rRNA analysis places strain Z-0531 into the family Geobacteraceae. Its closest relative (93% similarity) is Desulfuromonas palmitatis. Based on phenotypic distinctions and phylogenetic position, it is proposed that this strain be assigned to the new genus and species Geoalkalibacter ferrihydriticus gen. nov., sp. nov. (Z-0531T-DSMZ-17813-VKMB-2401).

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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

    D. G. Zavarzina, N. A. Kostrikina, T. P. Tourova & G. A. Zavarzin

  2. Bioengineering Center, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 1, Moscow, 117312, Russia

    T. V. Kolganova & E. S. Boulygina

Authors
  1. D. G. Zavarzina
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  2. T. V. Kolganova
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  3. E. S. Boulygina
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  4. N. A. Kostrikina
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  5. T. P. Tourova
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  6. G. A. Zavarzin
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Correspondence to D. G. Zavarzina.

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Original Russian Text © D.G. Zavarzina, T.V. Kolganova, E.S. Boulygina, N.A. Kostrikina, T.P. Tourova, G.A. Zavarzin, 2006, published in Mikrobiologiya, 2006, Vol. 75, No. 6, pp. 775–785.

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Zavarzina, D.G., Kolganova, T.V., Boulygina, E.S. et al. Geoalkalibacter ferrihydriticus gen. nov. sp. nov., the first alkaliphilic representative of the family Geobacteraceae, isolated from a soda lake. Microbiology 75, 673–682 (2006). https://doi.org/10.1134/S0026261706060099

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  • DOI: https://doi.org/10.1134/S0026261706060099

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