2GW5

Crystal Structure of LIR-2 (ILT4) at 1.8 : differences from LIR-1 (ILT2) in regions implicated in the binding of the Cytomegalovirus class I MHC homolog UL18

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1G0X	PDB entry 1G0X

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5		0.1M Hepes pH 7.5, 10% Isopropanol, 20% PEG 4000 streak seeded., VAPOR DIFFUSION, HANGING DROP

Crystal Properties
Matthews coefficient	Solvent content
2.38	48.33

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 62.53	α = 90
b = 62.53	β = 90
c = 106.917	γ = 90

Symmetry
Space Group	P 41 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	100	CCD	ADSC QUANTUM 4		2001-02-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL9-2	0.999	SSRL	BL9-2

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	1.8	34.1	99.3			20290	19241	1	1

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	1.8	1.83	100

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 1G0X	1.8	34.08	19239	991	99.38	0.2423	0.24041	0.27864	RANDOM	28.611

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]
					-0.01

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.96
r_dihedral_angle_4_deg	20.317
r_dihedral_angle_3_deg	16.954
r_dihedral_angle_1_deg	7.262
r_scangle_it	5.362
r_scbond_it	3.865
r_mcangle_it	2.451
r_angle_refined_deg	2.162
r_mcbond_it	1.623
r_symmetry_hbond_refined	0.368
r_nbtor_refined	0.319
r_nbd_refined	0.314
r_symmetry_vdw_refined	0.3
r_xyhbond_nbd_refined	0.206
r_chiral_restr	0.161
r_bond_refined_d	0.026
r_gen_planes_refined	0.01
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_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	1398
Nucleic Acid Atoms
Solvent Atoms	145
Heterogen Atoms	4

Software

Software
Software Name	Purpose
REFMAC	refinement
ADSC	data collection
SCALEPACK	data scaling
AMoRE	phasing