1887

Abstract

A Gram-negative, motile, rod-shaped, psychrophilic bacterium, LT17, was isolated from deep-sea sediments (3300 m depth) of the East Sea (Sea of Japan). Optimal growth of LT17 requires the presence of 2.5 % (w/v) NaCl, a pH of 7.0–7.5 and a temperature of 17 °C. The isolate grows optimally under a hydrostatic pressure of 10 MPa and growth is possible between 0.1 and <30 MPa. The novel strain is positive in tests for catalase, oxidase, lipase, -glucosidase and gelatinase activities and reduces nitrate to nitrate. The predominant cellular fatty acids are iso-C13 : 0, iso-C15 : 0, C16 : 0, C16 : 17 and C20 : 53. The DNA G+C content of strain LT17 is 38.8 mol%. Phylogenetic analysis of 16S rRNA gene sequences places this bacterium in the class , within the genus . The closest relatives of strain LT17 are (97.8 % gene sequence similarity), (97.5 %), (96.8 %), (96.5 %) and (95.4 %). The DNA–DNA hybridization levels between the novel isolate and its closest known phylogenetic relatives, and , are lower than 14 %. On the basis of this polyphasic evidence, strain LT17 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is LT17 (=KCTC 10635BP=JCM 12524).

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2007-02-01
2019-12-11
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A graph showing the growth rate of strain LT17 under varying pressure conditions. [PDF](33 KB)

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An extended phylogenetic tree based on 16S rRNA gene sequences. [PDF](34 KB)

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