2.7.1.58 | purified recombinant wild-type and mselenomethionine-labeled enzymes, sitting-drop vapor-diffusion, mixing of 0.0004 ml of 30 mg/m protein in 20 mM HEPES, pH 8.0, 250 mM NaCl, and 2 mM dithiothreitol, with 0.0004 ml of crystallization solution containing 0.1 M magnesium formate, 15%(w/v) PEG 3350, equilibration against 0.135 ml of crystallization solution, at 4°C or 24°C, method optimization, X-ray diffraction structure determination and analysis at 2.1 A resolution |