Query: NC_003413:1847935 Pyrococcus furiosus DSM 3638, complete genome
Lineage: Pyrococcus furiosus; Pyrococcus; Thermococcaceae; Thermococcales; Euryarchaeota; Archaea
General Information: This strain was isolated from a shallow marine solfataric (volcanic area that gives off sulfuric gases) region at Vulcano Island, Italy. This organism is a strictly anaerobic, hyperthermophilic archaeon. Growth occurs at temperatures between 67 and 103 degrees C, with optimal growth at 100 degrees C and a pH of 7.0. This organism is highly motile due to a bundle of flagella.
Subject: NC_000917:1693500 Archaeoglobus fulgidus DSM 4304, complete genome
Lineage: Archaeoglobus fulgidus; Archaeoglobus; Archaeoglobaceae; Archaeoglobales; Euryarchaeota; Archaea
General Information: This is the type strain (DSM 4304) of the Archaeoglobales, and was isolated from a geothermally heated sea floor at Vulcano Island, Italy. Doubling time is four hours under optimal conditions. The organism is an autotrophic or organotrophic sulfate/sulfite respirer. An additional distinguishing characteristic is blue-green fluorescence at 420 nm. This bacterium is the first sulfur-metabolizing organism to have its genome sequence determined. Growth by sulfate reduction is restricted to relatively few groups of prokaryotes; all but one of these are Eubacteria, the exception being the archaeal sulfate reducers in the Archaeoglobales. These organisms are unique in that they are only distantly related to other bacterial sulfate reducers, and because they can grow at extremely high temperatures. The known Archaeoglobales are strict anaerobes, most of which are hyperthermophilic marine sulfate reducers found in hydrothermal environments. High-temperature sulfate reduction by Archaeoglobus species contributes to deep subsurface oil-well 'souring' by iron sulfide, which causes corrosion of iron and steel in oil-and gas-processing systems.