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Thiofaba tepidiphila gen. nov., sp. nov., a novel obligately chemolithoautotrophic, sulfur-oxidizing bacterium of the Gammaproteobacteria isolated from a hot spring

NITE Biological Resource Center (NBRC), National Institute of Technology and Evaluation (NITE), 2-5-8 Kazusakamatari, Kisarazu, Chiba 292-0818, Japan

Correspondence
Koji Mori
mori{at}nbrc.nite.go.jp

A novel obligately chemolithoautotrophic, sulfur-oxidizing bacterium designated strain BDA453^T was isolated from a hot spring in Fukushima prefecture, Japan. The cells were short-rod-shaped and possessed an inclusion, a Gram-negative type cell wall and a single polar flagellum. Strain BDA453^T grew by sulfur-oxidizing respiration with thiosulfate, elemental sulfur, sulfide and tetrathionate as electron donors and used only carbon dioxide as a carbon source. The optimum growth conditions were 45 °C, pH 6.5 and the absence of NaCl. Analysis of the 16S rRNA gene revealed that the isolate was a member of the Gammaproteobacteria and related to the genera Halothiobacillus and Thiovirga in the family Halothiobacillaceae. However, the phylogenetic tree constructed using 16S rRNA gene sequences showed that strain BDA453^T was distant from any other known bacteria with sequence similarities of less than 90 %. On the basis of phenotypic features and phylogenetic analysis, strain BDA453^T is considered to represent a novel species of a new genus within the family Halothiobacillaceae, for which the name Thiofaba tepidiphila gen. nov., sp. nov. is proposed. The type strain of Thiofaba tepidiphila is BDA453^T (=NBRC 103218^T=DSM 19618^T).

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