6MC2
Crystal structure of a tetrameric DNA fold-back quadruplex
X-RAY DIFFRACTION
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, SITTING DROP | 6.4 | 295 | 100 mM magnesium chloride, 6 mM hexamminecobalt(III) chloride, 30 mM sodium cacodylate, equilibrated against 20% MPD |
Crystal Properties | |
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Matthews coefficient | Solvent content |
1.93 | 36.39 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 25.96 | α = 90 |
b = 46.96 | β = 101.12 |
c = 35.963 | γ = 90 |
Symmetry | |
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Space Group | I 1 2 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 | MARMOSAIC 225 mm CCD | 2016-10-23 | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | SYNCHROTRON | APS BEAMLINE 22-BM | 0.919 | APS | 22-BM |
Data Collection
Overall | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Merge I (Observed) | Rpim I (All) | 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 | 1.05 | 23.48 | 99.85 | 0.07 | 0.043 | 9.2 | 3.5 | 19770 |
Highest Resolution Shell | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R Merge I (Observed) | Rpim I (All) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | ||||||||||
1 | 1.05 | 1.09 | 0.228 | 0.16 |
Refinement
Statistics | |||||||||||||||||||
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Diffraction ID | Structure Solution Method | Cross Validation method | 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 | 1.05 | 23.48 | 18965 | 980 | 99.89 | 0.10836 | 0.10689 | 0.13722 | RANDOM | 10.177 |
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] | |
-0.41 | -0.55 | 0.75 | -0.11 |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
r_sphericity_free | 32.769 |
r_sphericity_bonded | 12.593 |
r_rigid_bond_restr | 7.055 |
r_long_range_B_refined | 3.922 |
r_long_range_B_other | 2.898 |
r_scangle_other | 2.497 |
r_angle_refined_deg | 2.405 |
r_scbond_other | 1.932 |
r_scbond_it | 1.93 |
r_angle_other_deg | 1.894 |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | |
Nucleic Acid Atoms | 370 |
Solvent Atoms | 123 |
Heterogen Atoms | 5 |
Software
Software | |
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Software Name | Purpose |
REFMAC | refinement |
MOSFLM | data reduction |
Aimless | data scaling |
PHENIX | phasing |