Query: NC_006177:3549467 Symbiobacterium thermophilum IAM 14863, complete genome Lineage: Symbiobacterium thermophilum; Symbiobacterium; Shewanellaceae; Clostridiales; Firmicutes; Bacteria General Information: This symbiotic and thermophilic bacterium was discovered by screening for thermostable tryptanophases in Japanese compost. Cultured growth of this organism requires the presence of another bacterial species, such as a Bacillus or Escherichia coli, which provides diffusable metabolites required for its growth. Pure cultures can be obtained by growing Symbiobacterium thermophilum in a bioreactor, separated from its symbiotic counterpart by a dialysis membrane. Because of its symbiotic nature, it cannot be cultured with conventional methods. Despite a negative reaction for gram stain, this species is placed with the gram-positive bacteria based on 16s phylogenetic analysis.
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General Information: This strain is a freshwater organism and is extensively studied due to its circadian clock which controls the expression of upwards of 800 genes during a 24 hour period. These unicellular cyanobacteria are also known as blue green algae and along with Prochlorococcus are responsible for a large part of the carbon fixation that occurs in marine environments. Synechococcus have a broader distribution in the ocean and are less abundant in oligotrophic (low nutrient) regions. These organism utilize photosystem I and II to capture light energy. They are highly adapted to marine environments and some strains have evolved unique motility systems in order to propel themselves towards areas that contain nitrogenous compounds. An obligate photoautotroph, it has been studied extensively by an international research community with respect to acquisition of organic carbon, transport and regulation of nitrogen compounds, adaptation to nutrient stresses, and reponse to light intensity.