Query: NC_016938:1492486 Melissococcus plutonius DAT561 chromosome 1, complete genome Lineage: Melissococcus plutonius; Melissococcus; Enterococcaceae; Lactobacillales; Firmicutes; Bacteria General Information: Causative agent of European foulbrood. Insect pathogen. Anaerobic or microaerophilic Gram-positive bacterium. European foulbrood is a disease of honeybee larvae, caused by the bacterium Melissococcus plutonius. It is found on all continents where bees are raised and an economically important disease in many honey-producing countries. Infected larvae usually die rapidly when they are 3-5 days old and in severe cases entire colonies can be lost.
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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.