X-RAY DIFFRACTION |
7.0 |
298 |
Prior to crystallization trials, purified CylK protein in storage buffer (20 mM HEPES pH 7.8, 50 mM NaCl, 10 mM MgCl2, 10 mM CaCl2, 10% glycerol) was combined with 5-undecylbenzene-1,3-diol (UDR), a substrate analog dissolved in protein storage buffer containing 22% DMSO. The final protein solution contained 10 mg/mL CylK and 1.66 mM UDR. Crystals of undecylresorcinol-bound CylK were obtained by using the hanging drop vapor diffusion method in 2 uL drops mixed in 1:1 ratio with a precipitant solution of 1.8 M sodium malonate, pH 7.0. Crystals formed within about 1 week at room temperature. CylK crystals were soaked in 2 M sodium malonate with 500 mM NaBr for up to 1 min |