Different traits for cold tolerance of extremely thermophilic Calditerricola strains isolated from mesothermal municipal sewage sludge and its hyperthermal compost.

Extreme thermophiles Calditerricola satsumensis DD2 and D3 were isolated from mesothermal municipal sludge, a material used for hyperthermal composting. To understand the ecologically anomalous findings, their behavior at various temperatures, membrane fatty acid composition, and draft genome sequences were compared with those of C. satsumensis YMO81 and Calditerricola yamamurae YMO722, already isolated from hyperthermal compost.