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 P4(1)2(1)2 or its enantiomorph P4(3)2(1)2, with unit-cell parameters a = b = 61.1, c = 276.3 A, and diffracted to 2.87 A resolution using a Cu K alpha 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 A3 Da-1 and a solvent content of 55.3%.