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Int J Syst Evol Microbiol 57 (2007), 467-471; DOI  10.1099/ijs.0.64640-0
© 2007 International Union of Microbiological Societies

Marinitoga okinawensis sp. nov., a novel thermophilic and anaerobic heterotroph isolated from a deep-sea hydrothermal field, Southern Okinawa Trough

Takuro Nunoura, Hanako Oida, Masayuki Miyazaki, Yohey Suzuki, Ken Takai and Koki Horikoshi

Subground Animalcule Retrieval (SUGAR) Program, Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan

Correspondence
Takuro Nunoura
takuron{at}jamstec.go.jp

A novel thermophilic and sulfur-reducing heterotrophic bacterium, strain TFS10-5T, was isolated from a deep-sea hydrothermal field in Yonaguni Knoll IV, Southern Okinawa Trough. Cells of strain TFS10-5T were motile rods, 1.5–5 µm in length and 0.5–0.8 µm in width. Strain TFS10-5T was an obligately anaerobic heterotroph and sulfur-reduction stimulated growth. Growth was observed between 30 and 70 °C (optimum at 55–60 °C), pH 5.0–7.4 (optimum at pH 5.5–5.8), 1.0–5.5 NaCl % (optimum at 3.0–3.5 %). The fatty acid content was C16 : 0 (71.0 %), C16 : 1 (6.0 %), C18 : 0 (21.4 %) and C18 : 1 (1.6 %). The G+C content of the genomic DNA was 28 mol%. 16S rRNA gene sequence analysis indicated that strain TFS10-5T belongs to the genus Marinitoga. Based on the physiological and phylogenetic features of the new isolate, strain TFS10-5T represents a novel species in the genus Marinitoga for which the name Marinitoga okinawensis sp. nov. is proposed. The type strain is TFS10-5T (=JCM 13303T=DSM 17373T).

Abbreviations: EPR, East-Pacific Rise; MAR, Mid-Atlantic Ridge

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain TFS10-5T is AB262395.

Graphs showing the effects of temperature, pH and NaCl concentration on the growth of strain TFS10-5T are available as a supplementary figure in IJSEM Online.






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