4.6.1.17 GTP-bound crystal structure 4.6.1.17 purified recombinant His-tagged enzyme, hanging drop vapour diffusion method, mixing of 0.003 ml of 10.5 mg/ml protein solution with 0.0015 ml reservoir solution containing 0.025 M potassium sodium tartrate tetrahydrate, pH 8.0, and equilibration against 1 ml reservoir solution, 15 days, X-ray diffraction structure determination and analysis at 3.0 A resolution, molecular replacement calculations 4.6.1.17 purified recombinant MoaC2s in apo form, X-ray diffraction structure determination and analysis at 2.2-2.5 A resolution 4.6.1.17 sitting-drop method, hanging-drop vapour-diffusion method, at room temperature