X-RAY DIFFRACTION |
7.00 |
293 |
AGAO CRYSTALS WERE GROWN IN ABOUT 2 WEEKS BY HANGING-DROP VAPOR DIFFUSION AT 293K. THE RESERVOIR WAS 1.0-1.5M (NH4)2SO4, 2MM CUSO4, 0.15M NA CITRATE, PH 6.0-7.5. THE DROPS WERE 1.5MICROL OF 11.7 MG/ML PROTEIN, 0.05M HEPES, PH 7.0, PLUS 1.5MICROL OF RESERVOIR SOLUTION. A SINGLE CRYSTAL WAS SOAKED WITH TCP BY SLOWLY ADDING TCP TO THE DROP TO ACHIEVE A 100 FOLD EXCESS OF TCP OVER ENZYME ACTIVE SITES. THE CRYSTAL WAS CRYOPROTECTED BY GRADUAL INCREMENTAL SOAKING IN RESERVOIR SOLUTION MIXED WITH GLYCEROL, WITH THE CONCENTRAION OF TCP BEING MAINTAINED CONSTANT. THE CONCENTRATION OF GLYCEROL WAS INCREASED FROM 0 TO 30% IN 2-3% INCREMENTS DURING 2 HOURS. |