| X-RAY DIFFRACTION |
8.2 |
? |
THROMBIN WAS PURCHASED FROM HAEMATOLOGIC TECHNOLOGIES, INC. AND ACETYL-HIRUDIN
FROM BACHEM. THROMBIN WAS PREPARED AS DESCRIBED (SKRZPCZAK-JANKUN ET AL., 1991)
.THROMBIN (1.0 MG/ML IN 50 MM HEPES, 50 % GLYCEROL, PH 7.0) WAS INCUBATED
WITH 1.0 MM ACETYL-HIRUDIN, 1.0 MM HEMI-BABIM, 1.0 MM ZN+2 FOR 1 HR AT 4 DEG
C. GLYCEROL WAS REMOVED AND THE COMPLEX CONCENTRATED WITH A CENTRICON 10 (
AMICON) TO 8.6 MG/ML AS DETERMINED BY THE BIORAD PROTEIN ASSAY KIT USING
BOVINE SERUM ALBUMIN. CRYSTALS OF THROMBIN-ACETYL-HIRUDIN-HEMI-BABIM-ZN+2 WERE
GROWN IN HANGING DROPS BY VAPOR DIFFUSION AFTER STREAK SEEDING. THE DROPS WERE
MADE FROM 5 MICROLITERS OF COMPLEX AND 5 MICROLITERS OF RESERVOIR SOLUTION (
0.10 M TRIS,0.50 M NACL, 22 % (BY VOLUME) PEG 4K, PH 8.20). |
