| X-RAY DIFFRACTION |
7.4 |
298 |
1.5 microliters of RebC (9 mg/mL in 150 mM NaCl, 10% glycerol, 25 mM HEPES pH 7.5) were incubated with 0.35 microliters of guanidine-HCl for 30 seconds, followed by addition of 1.5 microliters of precipitant solution (19% PEG-8000, 0.1 M HEPES pH 7.4), without mixing, at room temperature and sealed over a precipitant well solution. Immediately after set up, crystal trays were placed on a gel shaker and then, after 12 hours, transferred to a storage space in vibration-isolation. Reduced-RebC was generated by incubating a RebC crystal in a cryogenic solution (19% PEG-8000, 0.1 M HEPES pH 7.4, 20% glycerol) and adding an amount of solid sodium dithionite that is in slight excess of the point at which the crystal became completely clear, indicating that all FAD was reduced. The crystal was then flash-frozen in liquid nitrogen, VAPOR DIFFUSION, HANGING DROP, temperature 298K |
