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Int J Syst Evol Microbiol 58 (2008), 866-871; DOI  10.1099/ijs.0.65509-0
© 2008 International Union of Microbiological Societies

Neptunomonas japonica sp. nov., an Osedax japonicus symbiont-like bacterium isolated from sediment adjacent to sperm whale carcasses off Kagoshima, Japan

Masayuki Miyazaki1, Yuichi Nogi1, Yoshihiro Fujiwara1, Masaru Kawato1, Kaoru Kubokawa2 and Koki Horikoshi1

1 Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
2 Center for Advanced Marine Research, Ocean Research Institute, The University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164-8639, Japan

Correspondence
Masayuki Miyazaki
miyazakim{at}jamstec.go.jp

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.

Abbreviations: ASW, artificial seawater

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences acquired during this study are AB288092, AB291226–AB291228 and AB293969–AB293970.






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