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Sulfurimonas autotrophica gen. nov., sp. nov., a novel sulfur-oxidizing -proteobacterium isolated from hydrothermal sediments in the Mid-Okinawa Trough

¹ Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, Japan Marine Science and Technology Center (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
² The DEEP-STAR Group, Frontier Research System for Extremophiles, Japan Marine Science and Technology Center (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
³ Department of Earth Sciences, University of Southern California, 3651 Trousdale Pkwy, Los Angeles, CA 90089-0740, USA

Correspondence
Fumio Inagaki
inagaki{at}jamstec.go.jp

A novel mesophilic, sulfur- and thiosulfate-oxidizing bacterium, strain OK10^T, was isolated from deep-sea sediments at the Hatoma Knoll in the Mid-Okinawa Trough hydrothermal field. Cells of strain OK10^T were short rods, each being motile by means of a single polar flagellum. The isolate grew at 10–40 °C (optimum 25 °C) and pH 4·5–9·0 (optimum pH 6·5). It grew chemolithoautotrophically with elemental sulfur, sulfide and thiosulfate as sole electron donors and oxygen as electron acceptor. Molecular hydrogen did not support growth. The G+C content of the genomic DNA of strain OK10^T was 35·2 mol%. Phylogenetic analysis, based on 16S rRNA gene sequences, indicated that the isolate belonged to the -Proteobacteria. On the basis of its physiological and molecular characteristics, strain OK10^T (=ATCC BAA-671^T=JCM 11897^T) represents the sole species of a new genus, Sulfurimonas, for which the name Sulfurimonas autotrophica is proposed.

The DDBJ accession number for the 16S rDNA sequence of Sulfurimonas autotrophica OK10^T is AB088431.

Electron micrographs of a negatively stained cell and a thin-section of strain OK10^T are available as supplementary material in IJSEM Online.

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