This review deals with electron-transferring proteins purified from two strictly aerobic,
extremely thermophilic bacteria: Thermus thermophilus and Bacillus isolate PS3. The
advantage of working with proteins from thermophiles is that they are generally more
resistant to denaturation under conditions required for purification and experimentation. The
rationale for studying bacterial respiratory enzymes is more involved. In general, bacterial
respiration occurs by a reaction scheme very similar to that of mitochondria in which electron …