1IRA

COMPLEX OF THE INTERLEUKIN-1 RECEPTOR WITH THE INTERLEUKIN-1 RECEPTOR ANTAGONIST (IL1RA)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7		THE COMPLEX OF THE IL-1 RECEPTOR WITH THE ANTAGONIST WAS PREPARED BY MIXING A SOLUTION OF IL-1 RECEPTOR IN 50 MM TRIS (PH 7.5) AND 150 MM NACL WITH A SOLUTION OF IL1RA IN THE SAME BUFFER. THE COMPLEX WAS CRYSTALLIZED USING THE HANGING DROP METHOD. THE DROPS WERE PREPARED BY MIXING 4 UL OF THE PROTEIN SOLUTION WITH 1 UL OF RESERVOIR SOLUTION, CONTAINING 30% (W/V) PEG 3350, 400 MM MGCL2 IN 100 MM MOPS BUFFER (PH 7.0)., vapor diffusion - hanging drop

Crystal Properties
Matthews coefficient	Solvent content
2.7	54

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 47.2	α = 90
b = 84.6	β = 90
c = 140.2	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	296	AREA DETECTOR	SIEMENS	COLLIMATOR	1994-09-26	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	MACSCIENCE M18X

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	2.7	60	97.2	0.06		4.7		15631

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.7	2.8	85.3		0.325		3.1

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	MIR + MOLECULAR REPLACEMENT	THROUGHOUT	IL1RA STRUCTURE (PDB ENTRY 1ILR) AND TRUNCATED CD4 DOMAIN (PDB ENTRY 2CD4)	2.7	8	15012		97.6	0.213	0.213	0.314	RANDOM	45.2

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	26.5
x_scangle_it	17.7
x_mcangle_it	11.5
x_scbond_it	8.3
x_mcbond_it	5.4
x_angle_deg	1.2
x_improper_angle_d	1
x_bond_d	0.004
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3638
Nucleic Acid Atoms
Solvent Atoms	86
Heterogen Atoms	56

Software

Software
Software Name	Purpose
XDS	data scaling
XSCALE	data scaling
SQUASH	phasing
X-PLOR	model building
X-PLOR	refinement
XDS	data reduction
X-PLOR3.1	phasing