Structure of the Ca2+-bound synaptotagmin-1 SNARE complex (long unit cell form) - from XFEL diffraction
Serial Crystallography (SX)
Starting Model(s)
| Initial Refinement Model(s) |
|---|
| Type | Source | Accession Code | Details |
|---|
|
experimental model | PDB | 1N7S | 1N7S, 3F04, 1UOW | |
experimental model | PDB | 3F04 | 1N7S, 3F04, 1UOW | |
experimental model | PDB | 1UOW | 1N7S, 3F04, 1UOW |
Crystallization
| Crystalization Experiments |
|---|
| ID | Method | pH | Temperature | Details |
|---|
| 1 | VAPOR DIFFUSION, HANGING DROP | 7.4 | 293 | 0.25% v/v PEG8000, 25 mM HEPES-Na, 75 mM NaCl, 25 mM MgCl2, 0.25 mM CaCl2 |
| Crystal Properties |
|---|
| Matthews coefficient | Solvent content |
|---|
| 5.45 | 77.44 |
Crystal Data
| Unit Cell |
|---|
| Length ( Å ) | Angle ( ˚ ) |
|---|
| a = 69.386 | α = 90 |
| b = 170.676 | β = 90 |
| c = 291.014 | 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 | RAYONIX MX-325 | | 2014-05-20 | M | SINGLE WAVELENGTH |
| Radiation Source |
|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
|---|
| 1 | FREE ELECTRON LASER | SLAC LCLS BEAMLINE XPP | 1.307 | SLAC LCLS | XPP |
Serial Crystallography
| Fixed Target |
|---|
| Diffraction ID | Description | Sample Holding | Support Base | Motion control | Details | Sample Solvent |
|---|
| 1 | | cryo-loop | goniometer | DCSS | | 100 mM Tris-HCl (pH 8.5), 1.5 M ammonium sulfate |
| Measurement |
|---|
| Diffraction ID | Pulse Duration | Pulse Repetition Rate | Focal Spot Size | Pulse Energy | Photons Per Pulse |
|---|
| 1 | 40 (fs) | | 30 | 9 (KeV) | 1 |
| Data Reduction |
|---|
| Diffraction ID | Frames Indexed | Crystal Hits | Frames Indexed | Latices Merged |
|---|
| 1 | 309 | 578 | 309 | |
Data Collection
| Overall |
|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Merge I (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 | 3.5 | 20 | 97.8 | 0.494 | 0.943 | 3.6 | 6.1 | | 43622 | | | 66.8 |
| 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 | 3.5 | 3.56 | 89.2 | | 0.795 | 0.2 | 2.9 | |
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-Work (DCC) | R-Free (Depositor) | R-Free (DCC) | Mean Isotropic B |
|---|
| X-RAY DIFFRACTION | MOLECULAR REPLACEMENT | FREE R-VALUE | 1N7S, 3F04, 1UOW | 3.5 | 19.956 | 1.33 | 40510 | 2083 | 91.3 | 0.2939 | 0.292 | 0.29 | 0.3291 | 0.33 | 106 |
| 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 | 13.941 |
| f_angle_d | 0.45 |
| f_chiral_restr | 0.037 |
| f_plane_restr | 0.003 |
| f_bond_d | 0.002 |
| Non-Hydrogen Atoms Used in Refinement |
|---|
| Non-Hydrogen Atoms | Number |
|---|
| Protein Atoms | 10542 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 17 |
| Heterogen Atoms | 19 |
Software
| Software |
|---|
| Software Name | Purpose |
|---|
| PHENIX | refinement |
| PDB_EXTRACT | data extraction |
| cctbx.xfel | data reduction |
| cctbx.prime | data scaling |
| PHASER | phasing |