Three magnetotactic bacteria, designated strains PR-1T, PR-2T and PR-3T, were isolated from seawater collected from the Mediterranean Sea at the Pointe Rouge Marina in Marseille, France. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain PR-1T formed a clade with representatives of the genus Terasakiella, which previously did not include any magnetotactic members. Strains PR-1T shared 97.90% sequence similarity with Terasakiella brassicae B3T. Strains PR-2T and PR-3T were closely related to previously known magnetotactic strains, Magnetovibrio blakemorei MV-1T and Magnetococcus marinus MC-1T, with 16S rRNA gene sequence similarity of 94.40% and 97.39%, respectively. Strain PR-1T is a spirillum that produces two single flagella at each pole; strain PR-2T is a vibrio equipped with a single polar flagellum, while strain PR-3T is roughly spherical, with two sheathed bundles of flagella at a single pole (bilophotrichous). The major cellular fatty acids are C18 : 1 ω7c and C16 : 1 ω7c for strain PR-1T; C18 : 1 ω7c, C16 : 1 ω7c and C16 : 0 for strain PR-2T; and C16 : 1 ω7c and C16 : 0 for strain PR-3T. Based on phenotypic, genotypic and phylogenetic data, all three strains, PR-1T, PR-2T and PR-3T, are considered to represent three novel species. Strain PR-1T belongs to the genus Terasakiella, for which the name Terasakiella magnetica sp. nov. is proposed. The type strain is PR-1T (=TSD-367T=JCM 39464T). Strain PR-2T belongs to the genus Magnetovibrio, for which the name Magnetovibrio massiliensis sp. nov. is proposed. The type strain is PR-2T (=TSD-368T=JCM 39465T). Strain PR-3T belongs to the genus Magnetococcus, for which the name Magnetococcus organivorans sp. nov. is proposed. The type strain is PR-3T (=TSD-369T=JCM 39466T).
Koziaeva et al. (Mon,) studied this question.
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