title: Neptunomonas japonica sp. nov., an Osedax japonicus symbiont-like bacterium isolated from sediment adjacent to sperm whale carcasses off Kagoshima, Japan.
abstract: Novel bacterial species were isolated from sediments adjacent to sperm whale carcasses off Kagoshima, Japan, at a depth of 226-246 m. The isolated strains, JAMM 0745T, JAMM 1380, JAMM 1475 and JAMM 1610, were Gram-negative, rod-shaped, non-spore-forming and motile by means of a single polar or subterminal flagellum. Phylogenetic analysis based on 16S rRNA gene sequences of the novel isolates indicated a relationship to a symbiotic bacterial clone of the polychaete Osedax japonicus (99.6-99.9 % sequence similarity) and these bacteria were closely related to members of the genus Neptunomonas (95.6-96.0 % similarity) within the class Gammaproteobacteria. The novel strains were able to produce isoprenoid quinone Q-8 as the major quinone component. The predominant fatty acids were C16 : 0, C16 : 1 and C18 : 1, with C18 : 2 and C20 : 2 present in smaller amounts. The DNA G+C contents of the four novel strains were about 43.6-43.8 mol%. Based on the taxonomic differences observed, the four isolated strains appear to represent a novel species of the genus Neptunomonas. The name Neptunomonas japonica sp. nov. (type strain JAMM 0745T=JCM 14595T=DSM 18939T) is proposed for the novel strains.
authors.affiliation: Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan. miyazakim@jamstec.go.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Nogi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Fujiwara
authors.forename: Masaru
authors.initials: M
authors.lastname: Kawato
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kubokawa
authors.forename: Koki
authors.initials: K
authors.lastname: Horikoshi
mesh_terms: D000818:Animals; D000845:Annelida / Q000382:microbiology; D001482:Base Composition; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D017753:Ecosystem; D005227:Fatty Acids / Q000378:metabolism; D005798:Genes, Bacterial; D007564:Japan; D046529:Microscopy, Electron, Transmission; D008969:Molecular Sequence Data; D044130:Oceanospirillaceae / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D010641:Phenotype; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013559:Symbiosis; D009626:Terminology as Topic; D014907:Whales / Q000382:microbiology
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S