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Sulfurihydrogenibium kristjanssonii sp. nov., a hydrogen- and sulfur-oxidizing thermophile isolated from a terrestrial Icelandic hot spring

¹ Department of Biology, Portland State University, PO Box 751, Portland, OR 97207-0751, USA
² Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada

Correspondence
Anna-Louise Reysenbach
reysenbacha{at}pdx.edu

Three thermophilic, aerobic, hydrogen- and sulfur-oxidizing bacteria were isolated from an Icelandic hot spring near the town of Hveragerdi and share >99 % 16S rRNA gene sequence similarity. One of these isolates, designated strain I6628^T, was selected for further characterization. Strain I6628^T is a motile rod, 1.5–2.5 µm long and about 0.5 µm wide. Growth occurred between 40 and 73 °C (optimally at 68 °C), at pH 5.3–7.8 (optimally at pH 6.6) and at NaCl concentrations between 0 and 0.5 % (w/v). Strain I6628^T grew with H₂, S⁰ or as an electron donor with O₂ (up to 25 %, v/v; optimally at 4–9 %) as the sole electron acceptor. CO₂ and succinate were utilized as carbon sources but no organic compounds, including succinate, could be used as an energy source. The G+C content of the genomic DNA was determined to be 28.1 mol%. Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain I6628^T is a member of the genus Sulfurihydrogenibium, the closest cultivated relative being the recently described strain Sulfurihydrogenibium rodmanii UZ3-5^T (98.2 % sequence similarity). On the basis of the physiology and phylogeny of this organism, strain I6628^T represents a novel species of the genus Sulfurihydrogenibium, for which the name Sulfurihydrogenibium kristjanssonii sp. nov. is proposed. The type strain is I6628^T (=DSM 19534^T =OCM 901^T =ATCC BAA-1535^T).

Graphs showing the effects of temperature and pH on growth of strain I6628^T are available as supplementary figures with the online version of this paper.