Query: NC_010368:140500 Halobacterium salinarum R1 plasmid PHS3, complete sequence Lineage: Halobacterium salinarum; Halobacterium; Halobacteriaceae; Halobacteriales; Euryarchaeota; Archaea General Information: Chemoheterotrophic obligate extreme halophilic archeon. Halobacterial species are obligately halophilic microorganisms that have adapted to optimal growth under conditions of extremely high salinity 10 times that of sea water. This bacterium (strain R1; DSM 671) is an obligately halophilic archeon and represents the type species for the genus Halobacterium. The first recorded isolation of this organism came from the spoilage of salted fish. It is also commonly found in neutral salt lakes, marine salterns, proteinaceous products heavily salted with crude solar salt and ancient evaporate deposits.
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General Information: This organism is a coccoid bacterium originally isolated from a high-level radioactive waste cell at the Savannah River Site in Aiken, South Carolina, USA, in 2002. Radiation-resistant bacterium. Similarly to Deinococcus radiodurans, K. radiotolerans exhibits a high degree of resistance to ionizing gamma-radiation. Cells are also highly resistant to dessication. Kineococcus-like 16S rRNA gene sequences have been reported from the Mojave desert and other arid environments where these bacteria seem to be ubiquitous. Because of its high resistance to ionizing radiation and desiccation, K. radiotolerans has potential use in applications involving in situ biodegradation of problematic organic contaminants from highly radioactive environments. Moreover, comparative functional genomic characterization of this species and other known radiotolerant bacteria such as Deinococcus radiodurans and Rubrobacter xylanophilus will shed light onto the strategies these bacteria use for survival in high radiation environments, as well as the evolutionary origins of radioresistance and their highly efficient DNA repair machinery. This organism produces an orange carotenoid-like pigment. Cell growth occurs between 11-41 degresss C, pH 5-9, and in the presence of <5% NaCl and <20% glucose. Carbohydrates and alcohols are primary growth substrates.