Query: NC_016940:1698000 Saprospira grandis str. Lewin chromosome, complete genome Lineage: Saprospira grandis; Saprospira; Saprospiraceae; Sphingobacteriales; Bacteroidetes; Bacteria General Information: Gliding bacterium. Saprospira grandis is a gram-negative, marine, multicellular, filamentous flexibacterium. They prey on other bacteria by trapping and devouring them. It is significant because it is known for devouring bacteria and also has been shown to digest algae by the same process. This makes this bacterium important because it is useful in preventing harmful algal blooms. They are mesophilic with their optimum temperature being between 25-30 degrees C, and require a neutral pH. This filamentous organism is matile by gliding. This organism is able to lyse bacterial cells on the surfaces it is moving over.
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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.