Draft Genome Sequence of Magnetospirillum sp. Strain SO-1, a Freshwater Magnetotactic Bacterium Isolated from the Ol'khovka River, Russia.

Here, we present the draft genome sequence of Magnetospirillum sp. strain SO-1, a freshwater magnetotactic spirillum isolated from the sediments of the Ol'khovka River, Russia.

GENOME ANNOUNCEMENT

Magnetotactic bacteria are phylogenetically diverse microorganisms capable of synthesizing well-organized nanosized magnetic crystals enveloped by membrane, referred to as magnetosomes. The magnetosome biomineralization is under strict genetic control, and the genes responsible for a magnetic phenotype are combined in the magnetosome genomic island (MAI) (1, 2). Here, we present the draft genome sequence of Magnetospirillum sp. strain SO-1, a freshwater magnetotactic spirillum isolated from the sediments of the Ol’khovka River (43°56′07″N, 42°41′25″E; Caucasus region, Russia) (3).

The genome sequencing of Magnetospirillum sp. SO-1 was carried out using 454 GS FLX technology. Sequencing resulted in 284,391 reads, with an average read length of 356 bp and approximately 17× coverage. The reads were assembled with GS De Novo Assembler 2.6 and generated 261 contigs, with an N50 of 55,386 bp. The draft genome of Magnetospirillum sp. SO-1 consists of 261 contigs of 4,874,064 bp, with an average G+C content of 65.98 mol%. According to the primary annotation performed through the NCBI Prokaryotic Genomes Automatic Annotation Pipeline (PGAAP) (4), the genome contains 3 rRNA genes (5S-23S-16S) and 52 aminoacyl-tRNA synthetase genes. The genome coding density is 89.98%, with an average gene length of 941 bp. A total of 4,717 coding regions were found in the genome, of which 3,573 (75.75%) were functionally annotated using Rapid Annotations Subsystems Technology (RAST) online service (5). The genes essential for magnetosome formation in Magnetospirillum sp. SO-1 were organized in four operons within the MAI (mamGFDC, mms6, mamAB, and mamXY), as was shown previously for other Magnetospirillum spp. (2). The estimated size of the MAI is approximately 100 kb.

A functional comparison of the genome sequences available on the RAST server revealed the closest neighbors of Magnetospirillum sp. SO-1 to be Magnetospirillum magneticum AMB-1 (score, 548), Magnetospirillum gryphiswaldense MSR-1 (score, 527), Rhodospirillum rubrum ATCC 11170 (score, 408), and Azospirillum sp. strain B510 (score, 259).

Nucleotide sequence accession numbers.

This whole-genome shotgun project has been deposited at DDBJ/EMBL/GenBank under the accession no. AONQ00000000. The version described in this paper is the first version, AONQ01000000.