| 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 CRYSTAL WAS CRYOPROTECTED BY GRADUAL INCREMENTAL SOAKING IN RESERVOIR SOLUTION MIXED WITH GLYCEROL. THE CONCENTRATION OF GLYCEROL WAS INCREASED FROM 0 TO 30% IN 2-3% INCREMENTS DURING 2 HOURS. FOLLOWING CRYOPROTECTION, THE CRYSTAL WAS SOAKED FOR 15 MINUTES IN CRYOPROTECTANT WITH THE ADDITION OF 2 MILLIMOLAR BENZYLHYDRAZINE DIHYDROCHLORIDE (SIGMA). THE CRYSTAL WAS THEN FROZEN IN THE CRYOSTREAM. |