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Genome sequence and description of Gracilibacillus timonensissp. nov. strain Marseille-P2481T, a moderate halophilic bacterium isolated from the human gut microflora

Abstract : Microbial culturomics represents an ongoing revolution in the characterization of the human gut microbiota. By using three culture media containing high salt concentra-tions (10, 15, and 20% [w/v] NaCl), we attempted an exhaustive exploration of the halophilic microbial diversity of the human gut and isolated strain Marseille-P2481 (= CSUR P2481 = DSM 103076), a new moderately halophilic bacterium. This bacte-rium is a Gram- positive, strictly aerobic, spore-forming rod that is motile by use of a flagellum and exhibits catalase, but not oxidase activity. Strain Marseille-P2481 was cultivated in media containing up to 20% (w/v) NaCl, with optimal growth being ob-tained at 37°C, pH 7.0–8.0, and 7.5% [w/v] NaCl). The major fatty acids were 12- methyl-tetradecanoic acid and hexadecanoic acid. Its draft genome is 4,548,390 bp long, composed of 11 scaffolds, with a G+C content of 39.8%. It contains 4,335 pre-dicted genes (4,266 protein coding including 89 pseudogenes and 69 RNA genes). Strain Marseille-P2481 showed 96.57% 16S rRNA sequence similarity with Gracilibacillus alcaliphilus strain SG103T, the phylogenetically closest species with standing in nomenclature. On the basis of its specific features, strain Marseille- P2481T was classified as type strain of a new species within the genus Gracilibacillusfor which the name Gracilibacillus timonensis sp. nov. is formally proposed.
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Awa Diop, El Hadji Seck, Grégory Dubourg, Nicholas Armstrong, Caroline Blanc-Tailleur, et al.. Genome sequence and description of Gracilibacillus timonensissp. nov. strain Marseille-P2481T, a moderate halophilic bacterium isolated from the human gut microflora. MicrobiologyOpen, Wiley, 2019, 8 (2), ⟨10.1002/mbo3.638⟩. ⟨hal-02335014⟩

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