1.5.99.15 | purified recombinant N-terminally His6 -tagged enzyme by hanging drop vapor diffusion method, mixing of 0.003 ml of 13 mg/ml protein in 20 mM Tris-HCl, pH 8.0, 100 mM NaCl, 5% glycerol, and 4 mM DTT, with reservori solution containing FMN, method optimization, 7-14 days at room temperature, X-ray diffraction structure determination and analysis at 1.9 A resolution |