Crystal structure of Trypanosoma cruzi Dihydrofolate Reductase-Thymidylate Synthase in complex with (6S)-5,6,7,8-TETRAHYDROFOLATE
X-RAY DIFFRACTION
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 3INV | |
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | MICROBATCH | 298 | TcDHFR-TS 12.5 mg ml-1 in 25 mMTris pH 7.2 and 80 mMNaCl, precipitant solution 12% (w/v) PEG 3350, 100 mM sodium malonate pH 5 | |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 2.63 | 53.19 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 154.547 | α = 90 |
| b = 173.54 | β = 90 |
| c = 174.159 | γ = 90 |
| Symmetry | |
|---|---|
| Space Group | I 2 2 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 | PIXEL | DECTRIS PILATUS3 6M | 2015-12-07 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SYNCHROTRON | DIAMOND BEAMLINE I24 | 0.96861 | Diamond | I24 |
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 | 86.77 | 99.5 | 9.2 | 6.5 | 213627 | 2 | ||||||||||||
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 (Depositor) | R-Work (DCC) | R-Free (Depositor) | R-Free (DCC) | R-Free Selection Details | Mean Isotropic B | ||||
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | THROUGHOUT | 3INV | 1.8 | 86.77 | 202617 | 10547 | 99.23 | 0.17906 | 0.1769 | 0.19 | 0.21991 | 0.23 | RANDOM | 26.495 | ||||
| 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 | 33.032 |
| r_dihedral_angle_4_deg | 18.545 |
| r_dihedral_angle_3_deg | 14.54 |
| r_long_range_B_refined | 7.974 |
| r_dihedral_angle_1_deg | 6.481 |
| r_scbond_it | 3.828 |
| r_mcangle_it | 3.644 |
| r_mcbond_it | 2.748 |
| r_angle_refined_deg | 2.392 |
| r_chiral_restr | 0.202 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 15441 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 2024 |
| Heterogen Atoms | 588 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| REFMAC | refinement |
| iMOSFLM | data reduction |
| SCALA | data scaling |
| MOLREP | phasing |
