4QTX

Caspase-3 Y195A

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	APS BEAMLINE 22-BM
Synchrotron site	APS
Beamline	22-BM
Temperature [K]	100
Detector technology	CCD
Collection date	2010-03-13
Detector	MARMOSAIC 225 mm CCD
Wavelength(s)	1.0
Spacegroup name	I 2 2 2
Unit cell lengths	68.644, 84.493, 96.487
Unit cell angles	90.00, 90.00, 90.00

Refinement procedure

Resolution	27.967 - 1.974
R-factor	0.2049
Rwork	0.199
R-free	0.25890
Structure solution method	MOLECULAR REPLACEMENT
RMSD bond length	0.007
RMSD bond angle	1.095
Data reduction software	DENZO
Data scaling software	SCALEPACK
Phasing software	PHENIX
Refinement software	PHENIX ((phenix.refine: 1.8.2_1309))

Data quality characteristics

	Overall	Inner shell	Outer shell
Low resolution limit [Å]	27.967	2.210	1.990
High resolution limit [Å]	1.974	2.160	1.960
Number of reflections	18917
Completeness [%]	94.2	100	100

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, HANGING DROP	8.5	291	Proteins were dialyzed in a buffer of 10 mM Tris-HCl, pH 8.5, 1 mM DTT and concentrated to 10 mg/mL. 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 at 291K by the hanging drop vapor diffusion method using 4 L drops that contained equal volumes of protein and reservoir solutions over a 0.5 mL reservoir. The reservoir solutions for optimal crystal growth consisted of 100 mM sodium citrate, pH 5.0, 3 mM NaN3, 10 mM DTT, and 10% 16% PEG 6000 (w/v). Crystals appeared within 3.5 to 6 weeks for all mutants, VAPOR DIFFUSION, HANGING DROP