A novel thermophilic, microaerophilic, sulfur-reducing bacterium designated strain St55BT was isolated from a sulfide chimney in the hydrothermal field of Suiyo Seamount (Izu-Bonin Arc, Western Pacific). Cells of the isolate were rod-shaped and tended to form a chain-link circular structure (a rotund body) at exponential phase under good growth conditions. The isolate was a chemoheterotroph requiring yeast extract for growth. Although strain St55BT used oxygen as an electron acceptor, it could not form colonies in an oxygen concentration of more than 5% (v/v). The isolate also used nitrate, nitrite or elemental sulfur in the absence of oxygen. A phylogenetic analysis based on the 16S RNA gene sequence revealed that the isolate was closely related to Oceanithermus profundus, belonging to the phylum 'Deinococcus-Thermus' (sequence similarity 99.5%). However, strain St55BT differed from O. profundus in terms of usage of electron donors, cellular fatty acid profile and DNA G + C content. In addition, a DNA-DNA hybridization test indicated low relatedness between the isolate and O. profundus. For the reasons given above, the name Oceanithermus desulfurans sp. nov. is proposed for strain St55BT (= NBRC 100063T =DSM 15757T).
|Number of pages||6|
|Journal||International journal of systematic and evolutionary microbiology|
|Publication status||Published - 2004 Sep|
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics