| X-RAY DIFFRACTION |
7 |
292.15 |
Protein was diluted to 3 mg/ml using MonoQ buffer A and 1 ul was mixed with 2 ul of reservoir solution (0.1 M MES pH 7, 20% PEE 270, 3.67% acetone) in a hanging drop vapor diffusion experiment at 19 deg C to obtain the crystals for the native dataset used for SIRAS phasing and for refinement. Before the diffraction experiment, crystals were cryoprotected by soaking in a solution consisting of 0.1M MES pH7 and 35% PEE270.
For the Hg(II) derivative dataset used in SIRAS phasing, the crystal was grown in a similar fashion but using a reservoir solution comprising 0.1 M HEPES pH 7, 20% PEE 270. Derivatisation was performed by soaking the crystal for a couple of minutes in reservoir solution supplemented with 12.5 mM thimerosal. Crystals were back soaked and cryoprotected in mother liquor with an increased PEE 270 concentration (35%). |
