In PLoS One this week, and international team led by investigators at Germany's University of Duisburg-Essen report on the complete genome sequence of the hyperthermophilic Crenarchaeum Thermoproteus tenax (strain Kra1, DSM 2078T), a strictly anaerobic and sulfur-dependent Thermoproteales strain that grows optimally at 86°C and pH 5.6.