Methanohalophilus profundi sp. nov., a methylotrophic halophilic piezophilic methanogen isolated from a deep hypersaline anoxic basin
L’Haridon, Stéphane | Haroun, Hani | Corre, Erwan | Roussel, Erwan | Chalopin, Morgane | Pignet, Patricia | Balière, Charlotte | la Cono, Violetta | Jebbar, Mohamed | Yakimov, Michail | Toffin, Laurent
A novel anaerobic methylotrophic halophilic methanogen strain SLHTYROᵀ was isolated from a deep hypersaline anoxic basin called “Tyro” located in the Eastern Mediterranean Sea. Cells of SLHTYROᵀ were motile cocci. The strain SLHTYROᵀ grew between 12 and 37 °C (optimum 30 °C), at pH between 6.5 and 8.2 (optimum pH 7.5) and salinity from 45 to 240 g L⁻¹ NaCl (optimum 135 g L⁻¹). Strain SLHTYROᵀ was methylotrophic methanogen able to use methylated compounds (trimethylamine, dimethylamine, monomethylamine and methanol). Strain SLHTYROᵀ was able to grow at in situ hydrostatic pressure and temperature conditions (35 MPa, 14 °C). Phylogenetic analysis based on 16S rRNA gene and mcrA gene sequences indicated that strain SLHTYROᵀ was affiliated to genus Methanohalophilus within the order Methanosarcinales. It shared >99.16% of the 16S rRNA gene sequence similarity with strains of other Methanohalophilus species. Based on ANIb, AAI and dDDH measurements, and the physiological properties of the novel isolate, we propose that strain SLHTYROᵀ should be classified as a representative of a novel species, for which the name Methanohalophilus profundi sp. nov. is proposed; the type strain is SLHTYROᵀ (=DSM 108854 = JCM 32768 = UBOCC-M-3308).
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