6.3.1.9 | determination of three crystal forms, 18°C, hanging drop vapor diffusion method, 0.001 ml of protein solution is mixed with 0.001 ml of reservoir solution, for crystal form I were optimized to a reservoir of 1.4 M (NH4)2SO4, 100 mM HEPES, pH 7.0, 200 mM NaBr, crystal form II to 1.6 M (NH4)2SO4, 100 mM HEPES, pH 7.0, and 200 mM NaBr, and crystal form III to 14% polyethylene glycol 8000, 15% glycerol and 100 mM KCl, within 2 days, X-ray diffraction structure determination and analysis at 2.3-3.6 A resolution, modelling |