Huber, R. and Dyba, D. and Huber, Harald and Burggraf, S. and Rachel, Reinhard (1998) Sulfur-inhibited Thermosphaera aggregans sp. nov., a new genus of hyperthermophilic archaea isolated after its prediction from environmentally derived 16S rRNA sequences. International journal of systematic bacteriology 48, pp. 31-38.
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Recently, a new procedure was developed which allowed for the first time the isolation of a hyperthermophilic archaeum tracked by 165 rRNA analysis from a terrestrial hot solfataric spring ('Obsidian Pool', Yellowstone National Park, WY, USA). This novel isolate is characterized here. Cells are round cocci with a diameter of 0.2-0.8 micron, occurring singly, in pairs, short chains and in grape-like aggregates. The aggregates exhibit a weak bluish-green fluorescence under UV radiation at 420 nm. The new isolate is an anaerobic obligate heterotroph, using preferentially yeast extract for growth. The metabolic products include CO2, H2, acetate and isovalerate. Growth is observed between 65 and 90 degrees C (optimum: 85 degrees C), from pH 5.0 to 7.0 (optimum: 6.5) and up to 0.7% NaCl. The apparent activation energy for growth is about 149 kJ mol-1. Elemental sulfur or hydrogen inhibits growth. The core lipids consist mainly of acyclic and cyclic glycerol diphytanyl tetraethers. The cell envelope contains a cytoplasmic membrane covered by an amorphous layer of unknown composition; there is no evidence for a regularly arrayed surface-layer protein. The G + C content is 46 mol%. On the basis of 165 rRNA sequence comparisons in combination with morphological, physiological and biochemical properties, the isolate represents a new genus within the Desulfurococcaceae, which has been named Thermosphaera. The type species is Thermosphaera aggregans, the type strain is isolate M11TLT (= DSM 11486T).
|Institutions:||Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Mikrobiologie > Prof. Dr. Michael Thomm|
|Subjects:||500 Science > 570 Life sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||15 Mar 2010 08:41|
|Last Modified:||15 Mar 2010 08:41|