Query: NC_014836:155924 Desulfurispirillum indicum S5 chromosome, complete genome Lineage: Desulfurispirillum indicum; Desulfurispirillum; Chrysiogenaceae; Chrysiogenales; Chrysiogenetes; Bacteria General Information: Environment: Fresh water; Temp: Mesophile. This is the first cultured species of the proposed new genus "Desulfurispirillum", and the sequencing of its genome will expand the range of experimental approaches that researchers can use to characterize its metabolic pathways for energy production and understand how these pathways are regulated. This organism is notable for its ability to reduce selenate to selenite and further to insoluble elemental selenium, in a process called dissimilatory selenate reduction.
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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.