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Desulfurobacterium indicum sp. nov., a thermophilic sulfur-reducing bacterium from the Indian Ocean
- Authors: Junwei Cao1, Tiphaine Birien2, Nicolas Gayet3, Zhaobin Huang4, Zongze Shao5, Mohamed Jebbar6, Karine Alain7
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1 11Shanghai Engineering Research Center of Hadal Scicence and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China 2 2UBO -UMR 6197 CNRS/UBO/Ifremer 3 3Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LM2E), Technopôle Pointe du diable, F-29280 Plouzané, France 4 4Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China 5 5State Key Laboratory Breeding Base of Marine Genetic Resources; Key Laboratory of Marine Genetic Resources, The Third Institute of State Oceanic Administration; Collaborative Innovation Center of Marine Biological Resources; Key Laboratory of Marine Genet 6 6UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LM2E), Rue Dumont d’Urville, F-29280 Plouzané, France 7 7CNRS - UMR6197 CNRS/UBO/Ifremer - LM2E
- First Published Online: 01 February 2017, International Journal of Systematic and Evolutionary Microbiology doi: 10.1099/ijsem.0.001837
- Issue Published:
A novel sulfur-reducing bacterium, strain K6013T, was isolated from a sulfide sample collected at a depth of 2,771 m from a high-temperature hydrothermal vent in the Indian Ocean. Cells were Gram-negative, anaerobic, motile rods (0.9-2.2 × 0.4-0.6 μm). The strain grew at NaCl concentrations ranging from 1 to 4.5% (w/v) (optimum 2.5%), from pH 5 to 8 (optimum 6), and at temperatures between 40 and 75 °C (optimum 65 °C). Strain K6013T was an obligate chemolithoautotroph using thiosulfate, sulfur, and nitrate as terminal electron acceptors in the presence of H2, but not sulfate, sulfite nor nitrite. The major cellular fatty acids were C16:0 (17.4%), C18:1 ω7c (Summed feature 8, 37.91%), C18:0 (18.29%) and C14:0 3-OH (Summed feature 2, 8.56%). The DNA G+C content was 38.2 mol%. Phylogenetic 16S rRNA gene sequence analyses showed that strain K6013T falls into the genus Desulfurobacterium within the class Aquificae, with highest sequence similarity of 96.93% to Desulfurobacterium atlanticum SL22T. On the basis of genotypic and phenotypic data, strain K6013T is considered to represent a novel species of the genus Desulfurobacterium, for which the name Desulfurobacterium indicum sp. nov. is proposed, with the type strain K6013T (= DSM 101677T= MCCC 1A01868T).
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