| X-RAY DIFFRACTION |
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291 |
Hydrox crystals were obtained by the hanging drop vapor diffusion method by combining equal volumes of protein solution (Hydrox (5 mg/ml), lysine (50 mM, pH 7), sodium succinate (20 mM, pH 7), and vanadium(IV) oxide sulfate hydrate (1 mM)) and reservoir solution (HEPES (100 mM), 16% (w/v) PEG 6000, magnesium chloride hexahydrate (200 mM), pH 9). Crystals grew in three days and were transferred to an Eppendorf tube containing 250 uL of reservoir solution and vortexed for 30 seconds with 10 x 1 um diameter zirconia/silica beads to produce a micro-seed solution. The seed solution was stored at -80C for future use. Subsequent crystals were prepared by micro-seeding equal volumes of protein solution (Hydrox (5 mg/ml), lysine (50 mM, pH 7), sodium succinate (20 mM, pH 7), and vanadium(IV) oxide sulfate hydrate (1 mM)) and reservoir solution (HEPES (100 mM), 16% (w/v) PEG 6000, magnesium chloride hexahydrate (200 mM), pH 9) |
