Query: NC_008528:610070 Oenococcus oeni PSU-1, complete genome Lineage: Oenococcus oeni; Oenococcus; Leuconostocaceae; Lactobacillales; Firmicutes; Bacteria General Information: This strain was isolated at Penn State University, USA and is used commercially for malolactic fermentation in wines. Lactic acid bacterium used in wine production. Oenococcus oeni is another member of the lactic acid bacteria and it occurs naturally in marshes and similar environments. It carries out malolactic conversion during secondary fermentation in wine production which is the conversion of malic acid to lactic acid with a concomitant rise in pH, making the wine microbiologically stable and enhancing the sensory properties of the wine (aroma, flavor, and texture). The organism's high tolerance to sulfite and ethanol mean that it will be the predominant organism in the wine at the end of fermentation where it cleans up the remaining sugars and converts the bitter-tasting malic acid.
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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.