1SC1

Crystal structure of an active-site ligand-free form of the human caspase-1 C285A mutant

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.4	278	0.1 M HEPES, 2 M (NH4)2SO4, 25 mM DTT. 0.01% Triton-X was added to the drop to prevent the crystals from attaching themselves to the cover slips., pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 278K

Crystal Properties
Matthews coefficient	Solvent content
2.93	57.96

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 71.782	α = 90
b = 71.782	β = 90
c = 118.451	γ = 120

Symmetry
Space Group	P 32 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	180	IMAGE PLATE	RIGAKU RAXIS IV		2003-05-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH3R

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	2.6	20	99.6	0.107				11308

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.6	2.69	100		0.328

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1RWN	2.6	20	10163	1100	99.59	0.23486	0.23062	0.27273	RANDOM	51.343

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]
3.31	1.65		3.31		-4.96

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	5.476
r_mcangle_it	4.146
r_scangle_it	3.503
r_mcbond_it	2.356
r_scbond_it	2.121
r_angle_refined_deg	0.979
r_nbd_refined	0.186
r_symmetry_vdw_refined	0.161
r_xyhbond_nbd_refined	0.132
r_symmetry_hbond_refined	0.089
r_chiral_restr	0.065
r_bond_refined_d	0.007
r_gen_planes_refined	0.002
r_bond_other_d
r_angle_other_deg
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_gen_planes_other
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2030
Nucleic Acid Atoms
Solvent Atoms	60
Heterogen Atoms	1

Software

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