2V3V
A New Catalytic Mechanism of Periplasmic Nitrate Reductase from Desulfovibrio desulfuricans ATCC 27774 from Crystallographic and EPR Data and based on detailed analysis of the sixth ligand
X-RAY DIFFRACTION
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | 6.5 | 0.1M MES, PH 6.5, 7.5% PEG 8000 A COCRYSTALLISATION WITH 10MM OF KCLO4 (PERCHLORATE) IN 200MM OF DDNAPA (IE PROTEIN) WHICH HAD BEEN REDUCED BY DITHIONITE IN ANAEROBIC CONDITIONS AND THEN AIR REOXIDISED BEFORE SETTTING UP FOR CRYSTALLISATIONS STRAIGHT AFTER THAWING FROM -80C. | ||
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 2.42 | 55.44 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 106.566 | α = 90 |
| b = 106.566 | β = 90 |
| c = 135.479 | γ = 120 |
| Symmetry | |
|---|---|
| Space Group | P 31 2 1 |
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 | 2004-11-22 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SYNCHROTRON | ESRF BEAMLINE ID14-3 | ESRF | ID14-3 | |
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 | 1.91 | 46.13 | 93.5 | 0.114 | 10 | 7 | 454081 | 1 | |||||||||||
| 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 | 1.91 | 2.01 | 60.4 | 1.33 | 0.8 | 2.6 | |||||||||||||
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 | R-Free | R-Free Selection Details | Mean Isotropic B | ||||||
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | THROUGHOUT | PDB ENTRY 2NAP | 1.99 | 92.45 | 57324 | 2410 | 97.1 | 0.185 | 0.182 | 0.246 | RANDOM | 19.55 | ||||||
| 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] | |
| -1.33 | -0.67 | -1.33 | 2 | |||
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| r_dihedral_angle_2_deg | 36.345 |
| r_dihedral_angle_4_deg | 22.004 |
| r_dihedral_angle_3_deg | 17.287 |
| r_dihedral_angle_1_deg | 6.432 |
| r_scangle_it | 2.617 |
| r_scbond_it | 1.7 |
| r_angle_refined_deg | 1.698 |
| r_mcangle_it | 0.941 |
| r_mcbond_it | 0.589 |
| r_symmetry_hbond_refined | 0.314 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 5627 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 757 |
| Heterogen Atoms | 124 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| REFMAC | refinement |
| MOSFLM | data reduction |
| SCALEPACK | data scaling |
