sp. nov., a hyperthermophilic and acidophilic archaeon isolated from Indonesian hot spring, and reclassification of Suzuki . 2002 as comb. nov. Free

Abstract

A novel hyperthermophilic, acidophilic and facultatively anaerobic archaeon, strain KD-1, was isolated from an acidic hot spring in Indonesia and characterized with the phylogenetically related species Kurosawa . 1998, Suzuki ., 2002 and Jan . 1999. Cells of KD-1 were irregular cocci with diameters of 0.9–1.3 µm. The strain grew at 60–90 °C (optimum 80–85 °C), pH 2.5–6.0 (optimum pH 3.5–4.0) and 0–1.0 % (w/v) NaCl concentration. KD-1 grew anaerobically in the presence of S (headspace: H/CO) and FeCl (headspace: N). Under aerobic conditions, chemolithoautotrophic growth occurred on S, pyrite, KSO, NaSO and H. This strain utilized various complex substrates, such as yeast extract, but did not grow on sugars and amino acids as the sole carbon source. The main core lipids were calditoglycerocaldarchaeol and caldarchaeol. The DNA G+C content was 30.6 mol%. Analyses of phylogenetic trees based on 16S rRNA and 23S rRNA genes indicated that KD-1 formed an independent lineage near TA-1, 7 and YM1. On the basis of the results of morphological, physiological, chemotaxonomic and phylogenetic analyses, KD-1 represents a novel species of the genus Kurosawa 1998, for which the name sp. nov. is proposed. The type strain is KD-1 (=JCM 32117=InaCC Ar81). Based on the data, we also propose the reclassification of Suzuki , 2002 as comb. nov. (type strain 7=JCM 10545=DSM 16993).

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