| X-RAY DIFFRACTION |
8.5 |
291.15 |
Proteins were dialyzed in a buffer of 10 mM Tris-HCl (pH 8.5) and 1 mM DTT. The protein was concentrated to 10 mg/mL using Amicon ultrafree centrifugal filter devices, and inhibitor, Ac-DEVD-CMK reconstituted in DMSO, was then added at a 5:1 inhibitor:peptide ratio (w/w). The protein was diluted to a concentration of 8 mg/mL by adding 10 mM Tris-HCl (pH 8.5), concentrated DTT, and concentrated NaN3 so that the final buffer consisted of 10 mM Tris-HCl (pH 8.5), 10 mM DTT, and 3 mM NaN3. Crystals were obtained by the hanging drop vapor diffusion method. Concentrated protein (2 L) was mixed 1:1 with a reservoir solution that contained 100 mM sodium citrate (pH 5), 3 mM NaN3, 10 mM DTT, and 17% PEG 6000 (w/v). The crystallization plates were incubated at 18 C., VAPOR DIFFUSION, HANGING DROP, temperature 291.15K |
