Query: NC_003911:4001094 Silicibacter pomeroyi DSS-3, complete genome Lineage: Ruegeria pomeroyi; Ruegeria; Rhodobacteraceae; Rhodobacterales; Proteobacteria; Bacteria General Information: Formerly Silicibacter pomeroyi, his marine bacterium is a member of the Roseobacter clade and was isolated off of the coast of Georgia in 1998. Dimethylsulfoniopropionate-degrading bacterium. Capable of degrading the organic sulfur compound DMSP (dimethylsulfoniopropionate) and can metabolize a number of sulfur compounds. DMSP is synthesized by marine algae and the degradation product dimethylsulfide contributes to the global sulfur cycle.
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General Information: This biovar nodulates legumes in the Tribe Viciae (Vicia, Pisum, Lathyrus, Lens). This strain is a spontaneous streptomycin-resistant mutant of strain 300. Nitrogen-fixing plant symbiont. This organism, like other Rhizobia, establishes a symbiotic relationship with a legume plant, providing nitrogen in exchange for a protected environment. The legume roots secrete flavonoids and isoflavonoids which the bacteria recognize and use to turn on genes involved in root nodulation. Many of the root nodulation genes are involved in synthesis and secretion of a nodule inducing signal, a lipochito-oligosaccharide molecule, which the plant recognizes, triggering nodule formation. The bacterium is endocytosed and exists inside a membrane bound organelle, the symbiosome, and fixes nitrogen for the plant cell while the host cell provides carbon compounds for the bacterium to grow on. The nitrogen fixation is important as it obviates the need for expensive and environmentally damaging fertilizer use.