Biological Resource Center, NITE (NBRC)

Deferribacter desulfuricans SSM1T (= NBRC 101012T)


Deferribacter desulfuricans SSM1T is thermophilic (optimal temperature 60-65℃) and strictly anaerobic heterotroph capable of using versatile organic compounds. The strain SSM1T has been isolated from a deep-sea hydrothermal vent chimney at the Suiyo Seamount in the Izu-Bonin Arc, JAPAN1. Thermophilic microorganisms living on hydrothermal vents are exposed to physically and chemically fluctuating environments. It has also been shown, depending on the hydrothermal vent chimney environment, that Deferribacter-related species are the dominant species in these locations2.

The genome of D. desulfuricans SSM1 contains a single circular chromosome of 2,234,389 bp and a megaplasmid (pDF308) of 308,544 bp. Among the 2374 ORFs identified in the D. desulfuricans genome, ~30% of them showed high similarity to those of the species from Deltaproteobacteria, although D. desulfuricans is phylogenetically distant from Deltaproteobacteria. D. desulfuricans especially revealed orthologous relationships to bacteria that possesses sulphur or sulphate-reducing properties. The reconstructed central metabolic pathways from the D. desulfuricans genome showed that various organic acids could be utilize as carbon and energy sources. In addition, numerous genes for chemoreceptors, chemotaxis-like systems and signal transduction machineries encoded in the genome could be linked to the adaptation mechanisms required to survive in variable environments. The genome sequence of D. desulfuricans SSM1 should provide many insights for the better understanding of bacterial life in harsh environments around hydrothermal vents. This is the first complete genome sequence from the phylum Deferribactares.

Deferribacter desulfuricans SSM1T photo by Dr. Takai in JAMSTEC.


[1] Deferribacter desulfuricans sp. nov., a novel sulfur-, nitrate- and arsenate-reducing thermophile isolated from a deep-sea hydrothermal vent.
Takai K, Kobayashi H, Nealson KH, Horikoshi K. (2003)
Int. J. Syst. Evol. Microbiol. 53:839-846. [PMID:12807210]
[2] Evidence for the presence of thermophilic Fe(III)-reducing microorganisms in deep-sea hydrothermal vents at 13 degrees N (East Pacific Rise).
Slobodkin A, Campbell B, Cary SC, Bonch-Osmolovskaya E, Jeanthon C. (2001)
FEMS Microbiol. Ecol. 36:235-243. [PMID:11451528]
  Chromosome pDF308
Genomic size: 2,234,389 bp 308,544 bp
The number of ORFs: 2,117 257
GC content: 31.1% 24.5%
Genome Database: DOGAN
NBRC* No. : 101012
NBRC is the acronym for "the NITE Biological Resource Center".
The URL of NBRC is
Distribution of Our Microbial Genomic DNAs
At the Biological Resource Center of the National Institute of Technology and Evaluation (NITE Biological Resource Center, an Incorporated Administrative Agency), we have been distributing the microbial genomic DNA.

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