Crystal Structure of the Peptide-binding Protein NikA from Streptococcus agalactiae in Complex with Zinc and L-Histidine.
X-RAY DIFFRACTION
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 4D7R | |
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | VAPOR DIFFUSION, SITTING DROP | 7.2 | 292 | Protein: 12.9 mg/ml, 10mM HEPES (pH 7.2), 1mM TCEP, 2% Glycerol, 5mM Imidazole; Screen: PEGs II (F8), 0.1M Sodium acetate, 25% (w/v) PEG 4000, 8% (w/v) Isopropanol; Cryo: Reservoir. |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 2.22 | 44.6 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 75.407 | α = 90 |
| b = 58.256 | β = 107.95 |
| c = 121.23 | γ = 90 |
| Symmetry | |
|---|---|
| Space Group | P 1 21 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 | PIXEL | DECTRIS EIGER2 X 9M | 2024-10-15 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SYNCHROTRON | NSLS-II BEAMLINE 17-ID-1 | 0.92020 | NSLS-II | 17-ID-1 |
Data Collection
| Overall | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Merge I (Observed) | R Sym I (Observed) | Rpim I (All) | CC (Half) | 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 | 1.95 | 30 | 99.8 | 0.2 | 0.2 | 0.089 | 0.984 | 8.8 | 5.8 | 72403 | -3 | 17.7 | |||||||
| Highest Resolution Shell | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R Merge I (Observed) | R-Sym I (Observed) | Rpim I (All) | CC (Half) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | ||||||||
| 1 | 1.95 | 1.98 | 99.5 | 0.86 | 0.86 | 0.384 | 0.428 | 2.1 | 5.6 | ||||||||||
Refinement
| Statistics | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 (Depositor) | R-Work (DCC) | R-Free (Depositor) | R-Free (DCC) | R-Free Selection Details | Mean Isotropic B | |||||
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | THROUGHOUT | 1.95 | 29.13 | 68623 | 3760 | 99.06 | 0.17424 | 0.17258 | 0.1838 | 0.20348 | 0.2222 | RANDOM | 21.565 | |||||
| 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] | |
| 0.61 | 0.33 | -19.85 | 19.24 | |||
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| r_dihedral_angle_3_deg | 5.735 |
| r_long_range_B_refined | 3.996 |
| r_long_range_B_other | 3.892 |
| r_dihedral_angle_1_deg | 2.624 |
| r_scangle_other | 1.669 |
| r_dihedral_angle_2_deg | 1.656 |
| r_angle_refined_deg | 1.463 |
| r_mcangle_it | 1.278 |
| r_mcangle_other | 1.278 |
| r_scbond_it | 1.037 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 8116 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 604 |
| Heterogen Atoms | 24 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| REFMAC | refinement |
| HKL-3000 | data reduction |
| HKL-3000 | data scaling |
| PHASER | phasing |














