2H48

Crystal structure of human caspase-1 (Cys362->Ala, Cys364->Ala, Cys397->Ala) in complex with 3-[2-(2-benzyloxycarbonylamino-3-methyl-butyrylamino)-propionylamino]-4-oxo-pentanoic acid (z-VAD-FMK)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1SC3	PDB ENTRY 1SC3

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	277	0.1M Pipes pH 6.0, 200 mM ammonium sulfate, 25% PEG 2000 MME, 10 mM DTT, 2 mM magnesium chloride, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.66	53.82

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 63.006	α = 90
b = 63.006	β = 90
c = 161.279	γ = 90

Symmetry
Space Group	P 43 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	120	IMAGE PLATE	RIGAKU RAXIS IV		2003-12-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU300

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	2.2	20	97.5				16802		2

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.2	2.28	99.7

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1SC3	2.2	20	16372	15593	829	95.24	0.21674	0.21674	0.21392	0.27242	RANDOM	35.929

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
1.05			1.05		-2.09

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.927
r_dihedral_angle_4_deg	15.628
r_dihedral_angle_3_deg	15.555
r_dihedral_angle_1_deg	4.99
r_mcangle_it	2.744
r_scangle_it	2.462
r_mcbond_it	1.608
r_scbond_it	1.498
r_angle_refined_deg	0.952
r_nbtor_refined	0.295

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.927
r_dihedral_angle_4_deg	15.628
r_dihedral_angle_3_deg	15.555
r_dihedral_angle_1_deg	4.99
r_mcangle_it	2.744
r_scangle_it	2.462
r_mcbond_it	1.608
r_scbond_it	1.498
r_angle_refined_deg	0.952
r_nbtor_refined	0.295
r_nbd_refined	0.168
r_symmetry_vdw_refined	0.133
r_xyhbond_nbd_refined	0.117
r_symmetry_hbond_refined	0.113
r_chiral_restr	0.061
r_bond_refined_d	0.006
r_gen_planes_refined	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2097
Nucleic Acid Atoms
Solvent Atoms	162
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
CrystalClear	data reduction
d*TREK	data scaling
AMoRE	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.