| X-RAY DIFFRACTION |
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289 |
The FruK variant K95H (3.4 mg/mL) in 20 mM MOPS/KOH buffer (pH 7.4) containing 75 mM KCl and 1 M L-proline was mixed in a 1:1 ratio with condition containing 1 M ammonium sulfate, 75 mM TRIS/HCl (pH 8.5), 150 mM lithium sulfate, 8 mM fructose-6-phosphate, 4 mM ADP, and 10 mM magnesium chloride. The final drop volume was 0.8 microliters. Before plunge freezing in liquid nitrogen, the crystals were soaked with additional 25 mM fructose-6-phosphate, 12.5 mM magnesium chloride for about 1 minute, before glycerol was added as a cryo-protectant to a final concentration of 30% (v/v). |