Crystallization and preliminary X-ray analysis of a novel dye-linked L-proline dehydrogenase from the aerobic hyperthermophilic archaeon Aeropyrum pernix

A novel dye-linked L-proline dehydrogenase from the aerobic hyperthermophilic archaeon Aeropyrum pernix was crystallized using the sitting-drop vapour-diffusion method with polyethylene glycol 8000 as the precipitant. The crystals belonged to the tetragonal space group P4₁2₁2 or its enantiomorph P4₃2₁2, with unit-cell parameters a = b = 61.1, c = 276.3 Å, and diffracted to 2.87 Å resolution using a Cu Kα rotating-anode generator with an R-AXIS VII detector. The asymmetric unit contained one protein molecule, giving a crystal volume per enzyme mass (V_M) of 2.75 ų Da⁻¹ and a solvent content of 55.3%.