2.4.1.242 recombinant His-tagged GBSSI catalytic domain, residues Met83-Pro609, free or in complex with ADP-glucose, sitting drop vapour diffusion method, mixing of 0.0003 ml of 6 mg/ml protein in 20 mM Tris, pH 8.0, and 0.2 M NaCl, with 0.0003 m of reservoir solution, containing 1.5 M lithium sulfate and 0.1 M HEPES-sodium, pH 7.5, and equilibration against 0.05 ml of reservoir solution, 20°C, 4 weeks, X-ray diffraction structure determination and analysis at 2.7-3.0 A resolution