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1 UMR 6539, Centre National de la Recherche Scientifique et Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Nicolas Copernic, 29280 Plouzané, France
2 Marine Ecosystems Research Department, Japan Marine Science and Technology Centre, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
3 Laboratoire de Microbiologie et de Biotechnologie des Extrêmophiles, Département de Valorisation des Produits, IFREMER, Centre de Brest, BP 70, 29280 Plouzané, France
4 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany
5 Institute of Microbiology, RAS Prospekt 60 Let Oktyabrya 7/2, 117312 Moscow, Russia
Correspondence
Laurent Toffin
toffin{at}jamstec.go.jp
A novel piezotolerant, mesophilic, facultatively anaerobic, organotrophic, polarly flagellated bacterium (strain LT13aT) was isolated from a deep sediment layer in the Nankai Trough (Leg 190, Ocean Drilling Program) off the coast of Japan. This organism used a wide range of organic substrates as sole carbon and energy sources: pyruvate, glutamate, succinate, fumarate, lactate, citrate, peptone and tryptone. Oxygen, nitrate, fumarate, ferric iron and cystine were used as electron acceptors. Maximal growth rates were observed at a hydrostatic pressure of 10 MPa. Hydrostatic pressure for growth was in the range 0·1–50 MPa. Predominant cellular fatty acids were 16 : 1
7c, 15 : 0 iso, 16 : 0 and 13 : 0 iso. The G+C content of the DNA was 44·9 mol%. On the basis of 16S rRNA gene sequences, strain LT13aT was shown to belong to the 
-Proteobacteria, being closely related to Shewanella putrefaciens (98 %), Shewanella oneidensis (97 %) and Shewanella baltica (96 %). Levels of DNA homology between strain LT13aT and S. putrefaciens, S. oneidensis and S. baltica were <20 %, indicating that strain LT13aT represents a novel species. Genetic evidence and phenotypic characteristics showed that isolate LT13aT constitutes a novel species of the genus Shewanella. Because of the deep origin of the strain, the name Shewanella profunda sp. nov. is proposed, with LT13aT (=DSM 15900T=JCM 12080T) as the type strain.
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Shewanella profunda LT13aT is AY445591.
An electron micrograph and details of the growth behaviour and fatty acid and polar lipid compositions of strain LT13aT are available as supplementary material in IJSEM Online.
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