Crystallization and preliminary X-ray diffraction studies of pyrrolidone carboxyl peptidase from the hyperthermophilic archaeon Thermococcus litoralis

Pyrrolidone carboxyl peptidase from the hyperthermophilic archaeon Thermococcus litoralis has been crystallized in a form suitable for X-­ray diffraction from ammonium sulfate or ammonium dihydrogen orthophosphate using the vapour-phase diffusion method. Crystals from both precipitants are of the orthorhombic space group P2₁2₁2 with unit-cell dimensions a = 94.06, b = 149.06, c = 73.54 Å. A complete data set to 2.8 Å resolution has been collected from crystals grown from ammonium sulfate