2.4.1.115 | purified recombinant detagged enzyme, hanging drop vapor diffusion method, mixing of protein in 20 mM Tris-HCl, pH 7.4, 200 mM NaCl and 2 mM CaCl2, with reservoir solution containing 0.1 M sodium citrate tribasic dihydrate, pH 5.6, 0.2 M ammonium acetate and 26% w/v PEG 4000, equilibration against reservoir solution, 20°C, X-ray diffraction structure determination and analysis at 1.85 A resolution |