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International Journal of Systematic and Evolutionary Microbiology, Vol 52, 215-221, Copyright © 2002 by Society for General Microbiology

Desulfovibrio magneticus sp. nov., a novel sulfate-reducing bacterium that produces intracellular single-domain-sized magnetite particles

T. Sakaguchi, A. Arakaki and T. Matsunaga
Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan

A novel type of dissimilatory sulfate-reducing bacterium, designated strain RS-1(T), capable of producing intracellular magnetite particles (magnetosomes) was isolated from freshwater sulfide-rich sediments. Phylogenetic analysis based on 16S rDNA sequences revealed that RS-1(T) is a member of the genus Desulfovibrio. Its closest known relative is Desulfovibrio burkinensis (sequence similarity of 98.7%). Strain RS-1(T) contains desulfoviridin, c-type cytochromes and, unlike other Desulfovibrio spp., it possesses menaquinone MK-7(H(2)) instead of MK-6 or MK-6(H(2)). Strain RS-1(T) is also unique compared with other members of Desulfovibrio in its ability to synthesize intracellular magnetite particles. A novel species, Desulfovibrio magneticus sp. nov., is proposed for RS-1(T) (=ATCC 700980(T)=DSM 13731(T)), a sulfate-reducing magnetotactic bacterium.


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