ELECTRON MICROSCOPY
Refinement
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| f_dihedral_angle_d | 32.647 |
| f_angle_d | 0.715 |
| f_chiral_restr | 0.04 |
| f_plane_restr | 0.005 |
| f_bond_d | 0.004 |
| Sample |
|---|
| Natively purified hexameric nucleosome from Drosophila melanogaster |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK IV |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 38738 |
| Reported Resolution (Å) | 6.3 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C1 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 | ||||
| Refinement Space | REAL | ||||
| Refinement Protocol | FLEXIBLE FIT | ||||
| Refinement Target | |||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | The model was based on octameric nucleosome from this study. Coot and Phenix were used to adjust the existing model to the hexameric nucleosome densit ... | ||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | FEI FALCON IV (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 50.65 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | TFS TALOS |
| Minimum Defocus (nm) | 1000 |
| Maximum Defocus (nm) | 2500 |
| Minimum Tilt Angle (degrees) | |
| Maximum Tilt Angle (degrees) | |
| Nominal CS | |
| Imaging Mode | BRIGHT FIELD |
| Specimen Holder Model | FEI TITAN KRIOS AUTOGRID HOLDER |
| Nominal Magnification | |
| Calibrated Magnification | |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 200 |
| Imaging Details |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| PARTICLE SELECTION | cryoSPARC | 4.3.1 |
| IMAGE ACQUISITION | EPU | 3.4 |
| CTF CORRECTION | cryoSPARC | 4.3.1 |
| MODEL FITTING | UCSF ChimeraX | 1.8 |
| INITIAL EULER ASSIGNMENT | cryoSPARC | 4.3.1 |
| FINAL EULER ASSIGNMENT | cryoSPARC | 4.3.1 |
| RECONSTRUCTION | cryoSPARC | 4.3.1 |
| MODEL REFINEMENT | Coot | 0.9.8.7 |
| MODEL REFINEMENT | PHENIX | 1.21.5207 |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| PHASE FLIPPING AND AMPLITUDE CORRECTION | 'Patch CTF Estimation' in cryoSPARC | 231425 | Initially, nearly 15 million particles were picked from micrographs. However, the number of particles cited here (231,425) is the starting number of particles after initial cleanup and 3D classification of the data. | |
