1.5.1.7 | the apo-enzyme is obtained using the hanging drop vapour diffusion method with 100 mM Tris (pH 7.0) and 22% (w/v) PEG 8000, sulfate-, AMP-, and oxalylglycine-bound enzyme crystals are obtained by the hanging drop vapour diffusion method with 26% (w/v) PEG-MME 2000 in 100 mM Tris (pH 7.0) containing 200 mM (NH4)2SO4, or with 24% (w/v) PEG-MME 2000 in 100 mM Bis-Tris, pH 6.5, or with 24% (w/v) PEG-MME 2000 in 100 mM Tris, pH 8.0, at 4°C, respectively |