| X-RAY DIFFRACTION |
7.5 |
? |
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, 10 mM
4-iodobenzo[b]thiophene-2-carboxamidine for 1 hr at 4 deg C.
Glycerol was removed andthe complex concentrated with a
centricon 10 (Amicon) to about 10 mg/ml as determined by
the Biorad protein assay kit using bovine serum albumin.
Crystals of thrombin-acetyl-hirudin-4-iodobenzo[b]thiophene-2-carboxamidine
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 7.5)., VAPOR DIFFUSION |
