Crystal structure of Mycobacterium Tuberculosis Glutamine Synthetase in complex with a purine analogue inhibitor.
X-RAY DIFFRACTION
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 1HTO | PDB ENTRY 1HTO |
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | VAPOR DIFFUSION, HANGING DROP | 5 | 294 | EQUAL VOLUMES OF MOTHER LIQUOR (0.1 M SODIUM ACETATE, PH 5, 0.75 M 1,6-HEXANEDIOL) AND PROTEIN SOLUTION (10 G/L IN 0.020 M TRIS-HCL. PH 7.5, 0.15 M SODIUM CHLORIDE, 0.005 M MAGNESIUM CHLORIDE, 2%(V/V) DMSO, 0.0002 M INHIBITOR), VAPOR DIFFUSION, HANGING-DROP, TEMPERATURE 294K. |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 2.43 | 49 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 134.95 | α = 90 |
| b = 203.18 | β = 90 |
| c = 230.2 | γ = 90 |
| Symmetry | |
|---|---|
| Space Group | P 21 21 21 |
Diffraction
| Diffraction Experiment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
| 1 | 1 | x-ray | 100 | CCD | ADSC CCD | 2007-05-12 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SYNCHROTRON | ESRF BEAMLINE ID14-2 | ESRF | ID14-2 | |
Data Collection
| Overall | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 2.55 | 29.9 | 97.6 | 0.09 | 12.3 | 4.2 | 200628 | 45 | |||||||||||
| Highest Resolution Shell | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 2.55 | 2.65 | 95.6 | 0.45 | 3.8 | 4.2 | |||||||||||||
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 | PDB ENTRY 1HTO | 2.55 | 29.95 | 194667 | 10318 | 99.76 | 0.23098 | 0.2302 | 0.23 | 0.24586 | 0.24 | RANDOM | 41.987 | ||||
| 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] | |
| -0.6 | 1.62 | -1.02 | ||||
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| r_dihedral_angle_2_deg | 35.479 |
| r_dihedral_angle_3_deg | 15.359 |
| r_dihedral_angle_4_deg | 11.838 |
| r_dihedral_angle_1_deg | 5.628 |
| r_scangle_it | 2.054 |
| r_mcangle_it | 1.229 |
| r_scbond_it | 1.223 |
| r_angle_refined_deg | 1.22 |
| r_mcbond_it | 0.684 |
| r_symmetry_hbond_refined | 0.515 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 43920 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 1536 |
| Heterogen Atoms | 348 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| REFMAC | refinement |
| XDS | data reduction |
| XSCALE | data scaling |
| MOLREP | phasing |














