Query: NC_013939:1001974 Deferribacter desulfuricans SSM1, complete genome Lineage: Deferribacter desulfuricans; Deferribacter; Deferribacteraceae; Deferribacterales; Deferribacteres; Bacteria General Information: Thermophilic sulphur-reducing bacterium. Isolated from a deep-sea hydrothermal vent chimney at the Suiyo Seamount in the Izu-Bonin Arc, Japan. Deferribacter desulfuricans is an anaerobic, heterotrophic thermophile. It is a strictly anaerobic heterotroph capable of using complex organic compounds, ethanol and various organic acids as energy and carbon sources. Elemental sulfur, nitrate or arsenate was required for growth as an electron acceptor.
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General Information: This strain is the symbiont of the aphid Schizaphis graminum and contains a large circular chromosome. Aphid endosymbiont. Almost all aphids contain maternally transmitted bacteriocyte cells, which themselves contain bacteria called Buchnera. The aphids live on a restricted diet (plant sap), rich in carbohydrates, but poor in nitrogenous or other essential compounds. It is believed that the Buchnera provide the essential nutrients the host lacks. Besides a nutritional co-dependence, due to a co-existence of millions of years, Buchnera have lost the ability to produce cell surface components such as lipopolysaccharides. This makes for an obligate endosymbiont relationship between host and Buchnera. Buchnera are prokaryotic cells which belong to the gamma-Proteobacteria, closely related to the Enterobacteriaceae family. Phylogenetic studies using 16S rRNA indicate that the symbiotic relationship was established around 200-250 million years ago. Since Buchnera are closely related to Escherichia coli and Haemophilus influenzae, comparative genomic studies can shed light on the evolutionary mechanisms of intracellular endosymbiosis as well as the different underlying molecular basis between organisms with parasitic behavior and symbionts.