Kosmotoga pacifica sp. nov., a thermophilic chemoorganoheterotrophic bacterium isolated from an East Pacific hydrothermal sediment |
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Authors: | Stéphane L’Haridon Lijing Jiang Karine Alain Morgane Chalopin Ouafae Rouxel Mickaël Beauverger Hongxiu Xu Zongze Shao Mohamed Jebbar |
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Affiliation: | 1. Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM), UMR 6197, Place Nicolas Copernic, 29280, Plouzané, France 2. Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), CNRS, IUEM, UMR 6197, Place Nicolas Copernic, 29280, Plouzané, France 3. Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technop?le Pointe du diable, Ifremer, UMR 6197, 29280, Plouzané, France 4. Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, SOA, Daxue Road 184, Xiamen, 361005, China
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Abstract: | A novel strictly anaerobic thermophilic heterotrophic bacterium, strain SLHLJ1T, was isolated from a Pacific hydrothermal sediment. Cells were Gram-negative coccobacilli (approximately 1.0 × 0.6 μm) with a toga. It grew at temperatures between 33 and 78 °C (optimum 70 °C). Elemental sulphur and l-cystine stimulated its growth. It contained C16:0, C16:1 ω11c, C18:0 and C18:1 ω9c as major fatty acids (>5 %), 3 phospholipids and 2 glycolipids as polar lipids. Its DNA G+C content was 43.7 mol%. Phylogenetic analyses based on 16S rRNA gene sequences placed strain SLHLJ1T within the family Thermotogaceae. The novel isolate was most closely related to Kosmotoga arenicorallina (97.93 % 16S rRNA gene sequence similarity), K. olearia (92.43 %) and K. shengliensis (92.17 %). On the basis of phenotypic, chemotaxonomic and phylogenetic comparisons with its closest relatives, we propose its assignment to a novel species of the genus Kosmotoga. The name Kosmotoga pacifica sp. nov. is proposed with strain SLHLJ1T (=DSM 26965T = JCM 19180T = UBOCC 3254T) as the type species. |
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