1.2.1.18 | purified recombinant His-tagged enzyme, microseeding, mixing of 150 nl of 5 mg/ml protein in 40 mM Tris Cl, 150 mM NaCl, 2 mM KCl, and TBS, pH 8, with 150 nl of reservoir solution containing 23.7% w/v PEG 3350, 0.208 M trisodium citrate, 0.1 M Bis-Tris propane, pH 7.55, and equilibration against 0.05 ml of reservoir solution, at 8°C, X-ray diffraction structure determination and analysis at 2.95 A resolution, molecular replacement and modeling using PDB entry 4zz7 as a template |