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Exploration and isolation of novel thermophiles in frozen enrichment cultures derived from a terrestrial acidic hot spring

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Abstract

An isolation strategy, exploring novel microorganisms in frozen enrichment cultures (ENFE), which uses a combination of enrichment culture and 16S rRNA gene clone analysis, was evaluated for isolating uncultured thermophiles from a terrestrial acidic hot spring. The procedure comprised (a) multiple enrichment cultures under various conditions, (b) cryostorage of all enrichments, (c) microbial community analyses of the enrichments using 16S rRNA gene sequences, and (d) purification of microorganisms from enrichments containing previously uncultured microorganisms. The enrichments were performed under a total of 36 conditions, and 16 of these enrichments yielded positive microbial growth with the detection of three previously uncultured archaea. Two of the three previously uncultured archaea, strains HS-1 and HS-3, were successfully isolated. Strain HS-1 and HS-3 represented a novel lineage of the order Sulfolobales and novel species of the genus Sulfolobus, respectively. Although innovative isolation methods play strategic roles in isolating previously uncultured microorganisms, the ENFE strategy showed potential for characterizing and isolating such microorganisms using conventional media and techniques.

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Acknowledgments

We thank Mr. Tsujiuchi (President of Hakone Onsen Kyokyu Co. Ltd) and Mr. Katsumata (staff of the same company) for permission of sampling and safety guide for the field work, respectively. We also thank Dr. Dennis W. Grogan for carefully reading our manuscript. This research was financially supported by the Sasakawa Scientific Research Grant (27-436) from The Japan Science Society.

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Authors and Affiliations

  1. Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, 1-236 Tangi-machi, Hachioji, Tokyo 192-8577, Japan

    Hiroyuki D. Sakai & Norio Kurosawa

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  1. Hiroyuki D. Sakai
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  2. Norio Kurosawa
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Correspondence to Norio Kurosawa.

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Communicated by A. Oren.

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Sakai, H.D., Kurosawa, N. Exploration and isolation of novel thermophiles in frozen enrichment cultures derived from a terrestrial acidic hot spring. Extremophiles 20, 207–214 (2016). https://doi.org/10.1007/s00792-016-0815-0

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  • DOI: https://doi.org/10.1007/s00792-016-0815-0

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