Mw. Bauer et al., PURIFICATION AND CHARACTERIZATION OF A PROTEASOME FROM THE HYPERTHERMOPHILIC ARCHAEON PYROCOCCUS-FURIOSUS, Applied and environmental microbiology, 63(3), 1997, pp. 1160-1164
A 640-kDa proteasome consisting of alpha (25-kDa) and beta (22-kDa) su
bunits, and with a temperature optimum of 95 degrees C, was purified f
rom crude cell extracts of a hyperthermophilic archaeon, Pyrococcus fu
riosus. Although this is the fourth member of the kingdom Euryarchaeot
a (and the first hyperthermophile) found to contain a proteasome, none
has been identified among the members of the kingdom Crenarchaeota.