| X-RAY DIFFRACTION |
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293 |
Protein (Bcl6 BTB domain(1-129) 13 mg/ml in protein buffer( 20 mM Tris pH 8.3, 300 mM NaCl, 10% glycerol, 1 mM TECEP)) was mixed 1:1 with reservoir buffer (1.3M sodium formate, 0.1M Na acetate pH 5.2. Ostwald ripening of the early appearing crystals took place over about 5 days. To affect a partial dehydration the reservoir buffer was exchanged in 0.5 M steps to 4 M Na formate/0.1M Na acetate pH 5.2. In separate wells drops of soaking buffer ((1 M Na formate, 5% glycerol, 50 mM Na acetate pH5.2, 10 mM Tris pH 8.3, 150 mM NaCl) was also equilibrated against the 4 M formate/acetate. Crystals were transferred to equilibrated soaking buffer to which 2.5 mM OICR-4425 and 5% DMSO had been added. |
