RT XFEL structure of Photosystem II 1200 microseconds after the third illumination at 2.10 Angstrom resolution
X-RAY DIFFRACTION
Serial Crystallography (SX)
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 7RF1 | |
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | BATCH MODE | 6.5 | 298 | 0.1 M MES pH 6.5, 0.1 M NH4Cl, 35% (w/v) PEG 5000 |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 3.22 | 61.82 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 117.558 | α = 90 |
| b = 223.174 | β = 90 |
| c = 310.261 | 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 | 298 | CCD | RAYONIX MX340-HS | 2020-12-04 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | FREE ELECTRON LASER | SLAC LCLS BEAMLINE MFX | 1.302 | SLAC LCLS | MFX |
Serial Crystallography
| Sample delivery method | ||
|---|---|---|
| Diffraction ID | Description | Sample Delivery Method |
| 1 | Drop-on-tape | injection |
| Measurement | |||||
|---|---|---|---|---|---|
| Diffraction ID | Pulse Duration | Pulse Repetition Rate | Focal Spot Size | Pulse Energy | Photons Per Pulse |
| 1 | 40 (fs) | 20 | 7 | 9500 (KeV) | |
| Injection | |||||||
|---|---|---|---|---|---|---|---|
| Diffraction ID | Description | Flow Rate | Injector Diameter | Injection Power | Injector Nozzle | Filter Size | Carrier Solvent |
| 1 | Acoustic Droplet Ejection | 4 (µl/min) | undefined (µm) | acoustic wave | aqueous buffer | ||
Data Collection
| Overall | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | 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 | 2.1 | 29.48 | 99.9 | 0.988 | 3.54 | 99 | 471242 | 38.8 | |||||||||||
| Highest Resolution Shell | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | CC (Half) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||||||
| 1 | 2.1 | 2.14 | 0.07 | 0.34 | 8.1 | ||||||||||||||
Refinement
| Statistics | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diffraction ID | Structure Solution Method | Cross Validation method | Starting model | Resolution (High) | Resolution (Low) | Cut-off Sigma (F) | Number Reflections (Observed) | Number Reflections (R-Free) | Percent Reflections (Observed) | R-Factor (Observed) | R-Work (Depositor) | R-Free (Depositor) | R-Free (DCC) | Mean Isotropic B | |||||
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | FREE R-VALUE | 7RF1 | 2.1 | 29.48 | 1.33 | 463802 | 4120 | 98.34 | 0.1881 | 0.1877 | 0.2324 | 0.2166 | 45.17 | |||||
| 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] | |
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| f_dihedral_angle_d | 17.5261 |
| f_angle_d | 1.1658 |
| f_chiral_restr | 0.0521 |
| f_bond_d | 0.0093 |
| f_plane_restr | 0.0078 |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 41600 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 1540 |
| Heterogen Atoms | 8566 |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| PHENIX | refinement |
| PDB_EXTRACT | data extraction |
| cctbx.xfel | data reduction |
| cctbx.xfel.merge | data scaling |
| PHASER | phasing |














