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Halarchaeum solikamskense sp. nov., a thermotolerant neutrophilic haloarchaeon from the foamy products of flotation enrichment of potassium minerals

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Abstract

Three pigmented strains of halophilic archaea, RS94-RS96, were isolated from acidic foamy products of flotation enrichment of potassium minerals (Silvinit Co., Solikamsk, Russia). The cells were gram-negative, nonmotile, pleomorphic ovoids, 1.0−1.5 × 1.5−2.5 μm. The isolates were chemoorganotrophic, obligately aerobic, and catalase-positive. A range of carbohydrates and organic acids was used, as well as amino acids and peptides. The strains were halophiles and thermotolerant neutrophiles. They grew in the media with 15 to 30% NaCl (optimum at 20–22%) and 0.005–0.7 M Mg2+ (0.1–0.2 M), at pH 5.0–8.2 (optimum 7.0–7.2) and 25–55°C (optimum at 35–50°C). The major fatty acids were C16:0, C18:1, C18:0, and C16:1. The membranes contained carotenoid pigments of the bacterioruberin series and polar lipids, mostly as C20,C20 isoprenoid derivates: phosphatidylglyceromethylphosphate, phosphatidylglycerol, and three unidentified sulfated glycolipids of the S-DGD type. The DNA G+C content was 65.1–66.4 mol %. Phylogenetic analysis based on the 16S rRNA gene sequencing revealed that the thermotolerant neutrophilic isolate RS94 (DNA G+C content of 66.4 mol %) was most closely related to the nonpigmented moderate acidophile Halarchaeum acidiphilum MH1-52-1T (97.3%). Based on its phenotypic and genotypic characteristics, the organism was classified as a new species of the genus Halarchaeum with the proposed name Halarchaeum solikamskense sp. nov. The type strain is RS94T (= VKPM B-11282T).

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Authors and Affiliations

  1. Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences, Perm, Russia

    A. I. Saralov & E. M. Reutskikh

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

    R. V. Baslerov & B. B. Kuznetsov

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  1. A. I. Saralov
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  2. R. V. Baslerov
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  3. E. M. Reutskikh
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  4. B. B. Kuznetsov
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Correspondence to A. I. Saralov.

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Original Russian Text © A.I. Saralov, R.V. Baslerov, E.M. Reutskikh, B.B. Kuznetsov, 2012, published in Mikrobiologiya, 2012, Vol. 81, No. 5, pp. 638–644.

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Saralov, A.I., Baslerov, R.V., Reutskikh, E.M. et al. Halarchaeum solikamskense sp. nov., a thermotolerant neutrophilic haloarchaeon from the foamy products of flotation enrichment of potassium minerals. Microbiology 81, 589–595 (2012). https://doi.org/10.1134/S0026261712050141

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