Crystallization and preliminary X-ray crystallographic analysis of rabbit L-gulonate 3-dehydrogenase

Rabbit L-gulonate 3-dehydrogenase was crystallized using the oil-microbatch method at 295 K. X-ray diffraction data were collected to 1.70 Å resolution from a crystal at 100 K using synchrotron radiation. The crystal belongs to the C-­centred monoclinic space group C2, with unit-cell parameters a = 71.81, b = 69.08, c = 65.64 Å, β = 102.7°. Assuming the presence of a monomeric protomer in the asymmetric unit gives a V_M value of 2.21 ų Da⁻¹ and a solvent content of 44.4%. A cocrystal with NADH, which was isomorphous to the apo form, was also prepared and diffraction data were collected to 1.85 Å resolution using Cu Kα radiation at 100 K.