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A Gram-negative, motile, rod-shaped, psychrophilic bacterium, LT17T, was isolated from deep-sea sediments (3300 m depth) of the East Sea (Sea of Japan). Optimal growth of LT17T requires the presence of 2.5 % (w/v) NaCl, a pH of 7.0-7.5 and a temperature of 17 degrees C. The isolate grows optimally under a hydrostatic pressure of 10 MPa and growth is possible between 0.1 and &lt;30 MPa. The novel strain is positive in tests for catalase, oxidase, lipase, beta-glucosidase and gelatinase activities and reduces nitrate to nitrate. The predominant cellular fatty acids are iso-C13 : 0, iso-C15 : 0, C16 : 0, C16 : 1omega7 and C20 : 5omega3. The DNA G+C content of strain LT17T is 38.8 mol%. Phylogenetic analysis of 16S rRNA gene sequences places this bacterium in the class Gammaproteobacteria, within the genus Shewanella. The closest relatives of strain LT17T are Shewanella japonica (97.8 % gene sequence similarity), Shewanella pacifica (97.5 %), Shewanella olleyana (96.8 %), Shewanella frigidimarina (96.5 %) and Shewanella gelidimarina (95.4 %). The DNA-DNA hybridization levels between the novel isolate and its closest known phylogenetic relatives, S. japonica and S. pacifica, are lower than 14 %. On the basis of this polyphasic evidence, strain LT17T represents a novel species of the genus Shewanella, for which the name Shewanella donghaensis sp. nov. is proposed. The type strain is LT17T (=KCTC 10635BPT=JCM 12524T).

international journal of systematic and evolutionary microbiology

Shewanella donghaensis sp. nov., a psychrophilic, piezosensitive bacterium producing high levels of polyunsaturated fatty acid, isolated from deep-sea sediments