title: Hydrogenivirga okinawensis sp. nov., a thermophilic sulfur-oxidizing chemolithoautotroph isolated from a deep-sea hydrothermal field, Southern Okinawa Trough.
abstract: A novel extremely thermophilic sulfur-oxidizing bacterium, strain LS12-2(T), was isolated from a deep-sea hydrothermal field at the Yonaguni Knoll IV, Southern Okinawa Trough. Cells of strain LS12-2(T) were motile rods, 1.5-4.0 microm in length and 0.4-0.5 microm in width. Strain LS12-2(T) was an obligate chemolithoautotroph that could utilize elemental sulfur or thiosulfate as an electron donor and nitrate or oxygen as an electron acceptor. Growth was observed at 65-85 degrees C (optimum 70-75 degrees C), pH 5.8-8.3 (optimum pH 6.9-7.5), 1.0-4.0 % (w/v) NaCl (optimum 2.5 %) and 1.0-7.0 % O(2) in the gas phase (optimum 3.0 %). Fatty acids detected were C(16 : 0) (8.0 %), C(18 : 0) (9.0 %), C(18 : 1) (62.5 %) and C(20 : 1) (20.5 %). The genomic DNA G+C content was 51.3 mol%. 16S rRNA gene sequence analysis indicated that strain LS12-2(T) belonged to the genus Hydrogenivirga. Based on physiological and phylogenetic characteristics of the isolate, it is proposed that this strain represents a novel species in the genus Hydrogenivirga, Hydrogenivirga okinawensis sp. nov. The type strain of Hydrogenivirga okinawensis is LS12-2(T) (=JCM 13302(T)=DSM 17378(T)).
authors.affiliation: Subground Animalcule Retrieval (SUGAR) Program, Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan. takuron@jamstec.go.jp
authors.forename: Takuro
authors.initials: T
authors.lastname: Nunoura
authors.forename: Masayuki
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Yohey
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Ken
authors.initials: K
authors.lastname: Takai
authors.forename: Koki
authors.initials: K
authors.lastname: Horikoshi
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D020459:Genes, rRNA; D006091:Gram-Negative Chemolithotrophic Bacteria / Q000145:classification* / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D006358:Hot Temperature; D006859:Hydrogen / Q000378:metabolism*; D007564:Japan; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013455:Sulfur / Q000378:metabolism*
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D012336:RNA, Ribosomal, 16S; D013455:Sulfur; D006859:Hydrogen