1887

Abstract

A novel thermophilic, anaerobic, chemolithoautotrophic bacterium, strain SF97, was isolated from a terrestrial hot spring (Kuril Islands, Russia). Cells of strain SF97 were rod-shaped and motile with a Gram-positive cell-wall type. The novel isolate grew at 45–72 °C (optimum 65 °C) and pH 5.5–8.5 (optimum 6.0–6.5). The strain grew chemolithoautotrophically with molecular hydrogen as an electron donor, sodium sulfite or SO gas as an electron acceptor and bicarbonate/CO as a carbon source. Sulfate, thiosulfate, elemental sulfur, Fe(III) or nitrate were not used as electron acceptors either with H or organic electron donors. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate belonged to the family , order , and was distantly related to species of the genus (92–93 % sequence similarity). On the basis of its physiological properties and results of phylogenetic analyses, strain SF97 is considered to represent a novel species of a new genus, for which the name gen. nov., sp. nov. is proposed. The type strain of is SF97 (=DSM 102936=VKM B-2961). is the first reported obligate sulfite-reducing micro-organism.

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2017-02-01
2024-03-28
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