3QSF
The first crystal structure of a human telomeric G-quadruplex DNA bound to a metal-containing ligand (a nickel complex)
X-RAY DIFFRACTION
Starting Model(s)
Initial Refinement Model(s) | |||
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Type | Source | Accession Code | Details |
experimental model | PDB | 3QSC |
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, HANGING DROP | 7 | 293.15 | Initial conditions in the 3 ul drop were: 1.25mM quadruplex DNA, 1.25mM ligand, 0.83% PEG (w/v) 10 000, 16.7mM potassium chloride, 16.7mM sodium chloride, 16.7mM lithium sulphate and 20 mM potassium cacodylate buffer at pH 7.0. This was equilibrated against a reservoir well solution of 50% (w/v) PEG 10000 , VAPOR DIFFUSION, HANGING DROP, temperature 293.15K |
Crystal Properties | |
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Matthews coefficient | Solvent content |
2.7 | 54.4 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 44.02 | α = 90 |
b = 54.909 | β = 90 |
c = 33.691 | γ = 90 |
Symmetry | |
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Space Group | C 2 2 2 |
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 | 105 | CCD | ADSC QUANTUM 315r | 2010-06-28 | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | DIAMOND BEAMLINE I03 | 1.48660 | Diamond | I03 |
Data Collection
Overall | |||||||||||||||||||
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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 | 2.308 | 22.01 | 97.4 | 0.053 | 15.1 | 3.5 | 1888 | 1888 |
Highest Resolution Shell | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R Merge I (Observed) | R-Sym I (Observed) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | ||||||||||
1 | 2.31 | 2.43 | 89.8 | 0.153 | 0.153 | 4.6 | 2.7 | 242 |
Refinement
Statistics | |||||||||||||||||||
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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 (Observed) | R-Work | R-Free | R-Free Selection Details | Mean Isotropic B | |||||
X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | THROUGHOUT | 3QSC | 2.4 | 15 | 1684 | 1684 | 77 | 97 | 0.2404 | 0.2369 | 0.3203 | RANDOM | 34.0311 |
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] | |
0.73 | -0.07 | -0.66 |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
r_scangle_it | 4.428 |
r_scbond_it | 2.864 |
r_angle_refined_deg | 1.608 |
r_chiral_restr | 0.059 |
r_gen_planes_refined | 0.021 |
r_bond_refined_d | 0.014 |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | |
Nucleic Acid Atoms | 231 |
Solvent Atoms | 20 |
Heterogen Atoms | 48 |
Software
Software | |
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Software Name | Purpose |
SCALA | data scaling |
PHASER | phasing |
REFMAC | refinement |
PDB_EXTRACT | data extraction |
ADSC | data collection |
XDS | data reduction |