| X-RAY DIFFRACTION |
8.5 |
291 |
Caspase-3 variants were crystallized in the presence of
Ac-DEVD-CMK. PROTEINS WERE DIALYZED IN A BUFFER OF 10 MM TRIS-HCL,
PH 8.5, 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 5:1 WT:WT, INHIBITOR TO PEPTIDE.
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 WAS 10 MM TRIS-HCL, PH 8.5, 10 MM DTT, 3 MM NAN3. 2 UL OF
CONCENTRATED PROTEIN WAS MIXED 1:1 WITH WELL BUFFER THAT CONTAINED 100 MM
SODIUM CITRATE, PH 5, 3 MM NAN3, 10 MM DTT AND 17% PEG 6000 W/V. SOLUTIONS
WERE INCUBATED AT 18 DEG C USING THE HANGING DROP METHOD. CRYSTALS GREW
WITHIN THREE DAYS FOR WILD- TYPE CASPASE-3 AND WITHIN TWO WEEKS FOR THE MUTANTS. |
