2VXT
Crystal structure of human IL-18 complexed to murine reference antibody 125-2H Fab
X-RAY DIFFRACTION
Starting Model(s)
Initial Refinement Model(s) | |||
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Type | Source | Accession Code | Details |
experimental model | PDB | 1FNS | PDB ENTRY 1FNS |
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, HANGING DROP | 8.5 | 277 | IL-18 AND 125-2H FAB WERE MIXED (1:3 MASS RATIO), INCUBATED OVERNIGHT AT 277 K, PURIFIED BY MONOQ ANION EXCHANGE CHROMATOGRAPHY, AND CONCENTRATED TO 10 MG/ML. THE COMPLEX WAS CRYSTALLIZED BY HANGING DROP VAPOR DIFFUSION BY MIXING COMPLEX (1.5 MICROLITERS [UL]) WITH 1.8 UL OF RESERVOIR SOLUTION (30% PEG 4000, 100 MM TRIS, PH 8.5, 0.2 M MGCL2) AND 0.3 UL OF 300 MM SULFO-BETAINE 201, AND SUSPENDING THE DROP OVER THE RESERVOIR AT 291 K. ROD-LIKE CRYSTALS APPEARED WITHIN ONE WEEK. |
Crystal Properties | |
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Matthews coefficient | Solvent content |
2.2 | 44.1 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 44.345 | α = 90 |
b = 62.435 | β = 100.39 |
c = 104.734 | γ = 90 |
Symmetry | |
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Space Group | P 1 21 1 |
Diffraction
Diffraction Experiment | ||||||||||||||
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ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
1 | 1 | x-ray | 100 | CCD | MARRESEARCH | MIRRORS | 2003-04-29 | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | APS BEAMLINE 32-ID | APS | 32-ID |
Data Collection
Overall | |||||||||||||||||||
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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 | 1.49 | 50 | 94.8 | 0.06 | 10.4 | 3.5 | 86865 | 2 | 21 |
Highest Resolution Shell | |||||||||||||||||||
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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 | 1.49 | 1.54 | 56.6 | 0.35 | 2.3 | 2.1 |
Refinement
Statistics | |||||||||||||||||||
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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 1FNS | 1.49 | 31.16 | 82477 | 4364 | 95.5 | 0.164 | 0.162 | 0.196 | RANDOM | 17.54 |
Temperature Factor Modeling | ||||||
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Anisotropic B[1][1] | Anisotropic B[1][2] | Anisotropic B[1][3] | Anisotropic B[2][2] | Anisotropic B[2][3] | Anisotropic B[3][3] | |
0.36 | 0.84 | -0.33 | 0.28 |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
r_dihedral_angle_2_deg | 35.698 |
r_dihedral_angle_4_deg | 14.176 |
r_dihedral_angle_3_deg | 12.001 |
r_dihedral_angle_1_deg | 6.85 |
r_scangle_it | 3.508 |
r_scbond_it | 2.562 |
r_angle_refined_deg | 1.662 |
r_mcangle_it | 1.522 |
r_mcbond_it | 1.277 |
r_angle_other_deg | 0.92 |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | 4485 |
Nucleic Acid Atoms | |
Solvent Atoms | 593 |
Heterogen Atoms | 3 |
Software
Software | |
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Software Name | Purpose |
REFMAC | refinement |
HKL-2000 | data reduction |
SCALEPACK | data scaling |
AMoRE | phasing |