5OQV
Near-atomic resolution fibril structure of complete amyloid-beta(1-42) by cryo-EM
ELECTRON MICROSCOPY
| Sample |
|---|
| Beta-amyloid protein 42 fibrils |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | FILAMENT |
| Vitrification Instrument | FEI VITROBOT MARK IV |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | 2.5 microL sample was applied to the grid, blotted for 2.5 s before plunging. |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | HELICAL |
| Number of Particles | 127765 |
| Reported Resolution (Å) | 4 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | For the even/odd test, the fibrils were split after the final reconstruction (no gold-standard). These two half sets were then refined further indepen ... |
| Refinement Type | |
| Symmetry Type | HELICAL |
| Axial Symmetry | C1 |
| Axial Rise | 2.335 |
| Angular Rotation | -179.275 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 | ||||
| Refinement Space | REAL | ||||
| Refinement Protocol | AB INITIO MODEL | ||||
| Refinement Target | Cross-correlation coefficient | ||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | |||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | FEI FALCON III (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 24 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | FEI TECNAI ARCTICA |
| Minimum Defocus (nm) | |
| Maximum Defocus (nm) | |
| Minimum Tilt Angle (degrees) | |
| Maximum Tilt Angle (degrees) | |
| Nominal CS | 2.7 |
| Imaging Mode | BRIGHT FIELD |
| Specimen Holder Model | |
| Nominal Magnification | 110000 |
| Calibrated Magnification | |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 200 |
| Imaging Details |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| IMAGE ACQUISITION | EPU | 1.8.0.1533 |
| CTF CORRECTION | SPARX | 4.0 |
| INITIAL EULER ASSIGNMENT | SPARX | 4.0 |
| FINAL EULER ASSIGNMENT | SPARX | 4.0 |
| RECONSTRUCTION | SPARX | 4.0 |
| MODEL REFINEMENT | PHENIX | 1.11.1 |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||
