Oxidative stress response in an anaerobic hyperthermophilic archaeon: presence of a functional peroxiredoxin in Pyrococcus horikoshii.

Oxidative stress response in an anaerobic hyperthermophilic archaeon Pyrococcus horikoshii OT-3 was analyzed by two-dimensional gel electrophoresis. When P. horikoshii was grown on medium supplemented with air, a marked increase in the level of a 25-kDa protein was observed in comparison with cells grown under anaerobic conditions.