| X-RAY DIFFRACTION |
4.98 |
? |
TRYPSIN-BENZAMIDINE, P3(1) 2 1 WERE GROWN BY VAPOR DIFFUSION, AS DESCRIBED FOR
P2(1) 2(1) 2(1) (LARGE CELL) (MANGEL, ET AL., BIOCHEMISTRY 29, 8351-8357, 1990)
THE CRYSTAL WAS SOAKED FOR 25 DAYS IN 2.11 M ZN+2, 250 MM CL-, PH 4.86 IN THE
ABSENCE OF AN INHIBITOR. THIS SOLUTION WAS REPLACED ONCE EVERY DAY OR TWO TO
REMOVE BOUND BENZAMIDINE AND TO INCORPORATE ZN+2 AT THE ACTIVE SITE. IT WAS
THEN SOAKED IN CHLORIDE-FREE SOLUTION OF 1.02 MGSO4 . 7H2O, 1.62 M ZNSO4 . 7
H2O, 0.50 M ZINC ACETATE DIHYDRATE, PH 4.98 FOR 10 DAYS DURING WHICH THE
SOAKING SOLUTION WAS REPLACED ONCE A DAY. |
