Truepera radiovictrix DSM 17093

Truepera radiovictrix was isolated from a hot spring within a geothermal area located along the dry bed of a stream known as Ribeira Quente, on the Island of Sao Miguel in the Azores, Portugal. The hot springs in this area discharge neutral to slightly alkaline water that may reach the boiling point. Strain RQ-24T was isolated from a runoff with a temperature of 52 degrees Celsius and a pH of 7.0. The red-pigmented bacteria formed non-motile spherical cells about 1.25 to 2.0 um in diameter, most of which formed pairs or tetrads. The cytoplasm has a fibrillar nucleoid and tubular structures of unknown nature. The optimum pH of strain RQ-24T was between 7.5 and 9.5, but growth continues until pH 11.2. The optimal temperature is about 50 degrees Celsius, and maximal growth occurs in 1% NaCl, although it continues to grow in up to 6% NaCl. It is extremely resistant to ionizing radiation; 60% of the cells survive 5.0 kGy. It is aerobic, the major respiratory quinone is menaquinone 8 and no peptidoglycan was detected, although the cell wall is quite elaborate (adapted from PMID 15927420). (EBI Integr8)