Query: NC_016788:655175 Corynebacterium diphtheriae HC04 chromosome, complete genome Lineage: Corynebacterium diphtheriae; Corynebacterium; Corynebacteriaceae; Actinomycetales; Actinobacteria; Bacteria General Information: They may be found as members of the normal microflora of humans, where these bacteria find a suitable niche in virtually every anatomic site. This organism is the best known and most widely studied species of the genus. It is the causal agent of the disease diphtheria, a deadly infectious disease spreading from person to person by respiratory droplets from the throat through coughing and sneezing. In the course of infection, the bacteria invade and colonize tissues of the upper respiratory tract, proliferate and produce exotoxin that inhibits protein synthesis and causes local lesions and systemic degenerative changes in the heart, muscles, peripheral nerves, liver and other vital organs.
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General Information: Temp: Mesophile; Habitat: Host, Root nodule. This biovar is a symbiont of clover plants and is important commercially as it is used in the agricultural industry. Strain WSM1325 is compatible with many perennial clovers of Mediterranean origin used in farming, such as T. pratense, and is therefore one of the most important clover inoculants but is incompatible with American and African perennial clovers, such as those nodulated by the dissimilar strain WSM2304. 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.