6NXZ
Crystal structure of trimethoprim-resistant type II dihydrofolate reductase in complex with a bisbenzimidazole inhibitor
X-RAY DIFFRACTION
Starting Model(s)
Initial Refinement Model(s) | |||
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Type | Source | Accession Code | Details |
experimental model | PDB | 2RH2 |
Crystallization
Crystalization Experiments | ||||
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ID | Method | pH | Temperature | Details |
1 | VAPOR DIFFUSION, HANGING DROP | 8 | 277 | The protein concentration was adjusted from 13.3 mg/ml to 10 mg/mL by addition of a final concentration of 25% MPD. Reservoirs were prepared in Eppendorf tubes with 100mM Tris-Cl pH 8.0 55% MPD in a Greiner 24-well hanging-drop crystallization plate. On a siliconized glass cover slip (Hampton Research), 2.0 uL of protein solution were combined with 2.0 uL of the reservoir solution. The plate was incubated at 277 K, and crystals were obtained after 3-4 days. |
Crystal Properties | |
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Matthews coefficient | Solvent content |
2.21 | 44.24 |
Crystal Data
Unit Cell | |
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Length ( Å ) | Angle ( ˚ ) |
a = 67.617 | α = 90 |
b = 67.617 | β = 90 |
c = 51.977 | γ = 90 |
Symmetry | |
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Space Group | I 41 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 | 93 | CCD | RIGAKU SATURN 944+ | VariMax HF | 2014-09-30 | M | SINGLE WAVELENGTH |
Radiation Source | |||||
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ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
1 | ROTATING ANODE | RIGAKU MICROMAX-007 HF | 1.54 |
Data Collection
Overall | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Merge I (Observed) | Rrim I (All) | 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 | 1.75 | 50 | 94.3 | 0.204 | 0.205 | 0.02 | 4.6 | 79.2 | 6007 |
Highest Resolution Shell | |||||||||||||||||||
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ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | CC (Half) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||||||
1 | 1.75 | 1.78 | 48.7 | 0.697 | 1.5 |
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 | 2RH2 | 1.75 | 47.86 | 5681 | 319 | 94.27 | 0.1785 | 0.1768 | 0.2082 | RANDOM | 21.063 |
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] | |
0.12 | 0.12 | -0.25 |
RMS Deviations | |
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Key | Refinement Restraint Deviation |
r_dihedral_angle_2_deg | 36.412 |
r_dihedral_angle_3_deg | 16.031 |
r_dihedral_angle_4_deg | 14.721 |
r_dihedral_angle_1_deg | 6.246 |
r_angle_refined_deg | 2.061 |
r_angle_other_deg | 0.947 |
r_chiral_restr | 0.111 |
r_bond_refined_d | 0.02 |
r_gen_planes_refined | 0.01 |
r_bond_other_d | 0.001 |
Non-Hydrogen Atoms Used in Refinement | |
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Non-Hydrogen Atoms | Number |
Protein Atoms | 418 |
Nucleic Acid Atoms | |
Solvent Atoms | 60 |
Heterogen Atoms | 26 |
Software
Software | |
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Software Name | Purpose |
HKL-2000 | data reduction |
HKL-2000 | data scaling |
REFMAC | refinement |
PDB_EXTRACT | data extraction |
REFMAC | phasing |