5.1.1.5 | purified recombinant His-tagged enzyme, sitting drop vapor diffusion method, mixing of 2.5 mg/ml protein with 0.1 M sodium acetate, pH 4.6, 0.05 M lithium chloride, and 29% w/v PEG 8000, 20°C, X-ray diffraction structure determination and analysis at 1.74 A resolution |