What question did this study set out to answer?

This research aims to identify and characterize three novel species of magnetotactic bacteria isolated from the Mediterranean Sea.

April 16, 2026

Terasakiella magnetica sp. nov., Magnetovibrio massiliensis sp. nov. and Magnetococcus organivorans sp. nov., three novel magnetotactic bacteria isolated from the Mediterranean Sea

Key Points

This research aims to identify and characterize three novel species of magnetotactic bacteria isolated from the Mediterranean Sea.
Isolation of strains PR-1, PR-2, and PR-3 from seawater samples
Phylogenetic analysis using 16S rRNA gene sequences
Phenotypic characterization of the isolated strains
Analysis of cellular fatty acids
Strain PR-1 is proposed as Terasakiella magnetica sp. nov. with 97.90% similarity to Terasakiella brassicae.
Strains PR-2 and PR-3 are proposed as Magnetovibrio massiliensis sp. nov. and Magnetococcus organivorans sp. nov., respectively.
Phenotypic features included variations in flagella arrangements among the three strains.

Abstract

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).

AI से पूछें

Bookmark