Query: NC_016114:4922630 Streptomyces flavogriseus ATCC 33331 chromosome, complete genome Lineage: Streptomyces pratensis; Streptomyces; Streptomycetaceae; Actinomycetales; Actinobacteria; Bacteria General Information: Environment: Soil; Isolation: Soil; Temp: Mesophile. The genus Streptomyces consists of soil and water Gram positive filamentous bacteria well known for their ability to produce complex secondary metabolites including many antibiotics. Additionally they undergo complex multicellular development, with spores germinating to form a branched, multinucleoid substrate mycelium, which then produces an aerial mycelium which septates into uninucleoid spores. Streptomyces flavogriseus is an aerobic, Gram-positive bacterium isolated from soil. This organism produces cellulases and xyanases that are able to degrade cellulose and xylan.
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General Information: This strain was probably isolated from salmon eggs associated with a foodborne case of botulism in Alaska, however the exact details are not available. This genus comprises about 150 metabolically diverse species of anaerobes that are ubiquitous in virtually all anoxic habitats where organic compounds are present, including soils, aquatic sediments and the intestinal tracts of animals and humans. This shape is attributed to the presence of endospores that develop under conditions unfavorable for vegetative growth and distend single cells terminally or sub-terminally. Spores germinate under conditions favorable for vegetative growth, such as anaerobiosis and presence of organic substrates. It is believed that present day Mollicutes (Eubacteria) have evolved regressively (i.e., by genome reduction) from gram-positive clostridia-like ancestors with a low GC content in DNA. This organism produces one of the most potent and deadly neurotoxins known, a botulinum toxin that prevents the release of acetylcholine at the neuromuscular junction, thereby inhibiting muscle contraction and causing paralysis. In most cases the diseased person dies of asphyxiation as a result of paralysis of chest muscles involved in breathing. The spores are heat-resistant and can survive in inadequately heated, prepared, or processed foods. Spores germinate under favorable conditions (anaerobiosis and substrate-rich environment) and bacteria start propagating very rapidly, producing the toxin.Botulinum toxin, and C. botulinum cells, has been found in a wide variety of foods, including canned ones. Almost any food that has a high pH (above 4.6) can support growth of the bacterium. Honey is the most common vehicle for infection in infants. Food poisoning through C. botulinum is the most frequent type of infection caused by this bacterium. The wound botulism that occurs when C. botulinum infects an individual via an open wound is much rarer and is very similar to tetanus disease. There are several types of botulinum toxin known (type A through type F), all of them being neurotoxic polypeptides. The most common and widely distributed are strains and serovars of C. botulinum that produce type A toxin.