Structure of a native Drosophila melanogaster Nucleosome Elongation Complex (Pol II EC-nucleosome). Composite map
ELECTRON MICROSCOPY
Refinement
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| f_dihedral_angle_d | 22.99 |
| f_angle_d | 0.72 |
| f_chiral_restr | 0.046 |
| f_plane_restr | 0.005 |
| f_bond_d | 0.003 |
| Sample |
|---|
| Native purified Nucleosome Elongation Complex 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 | 36552 |
| Reported Resolution (Å) | 7.8 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | The Nucleosome EC was refined to an overall resolution of 7.8 A. Then, local refinement was performed with an indvidual focus on the nucleosome and Po ... |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C1 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 | ||||
| Refinement Space | |||||
| Refinement Protocol | AB INITIO MODEL | ||||
| Refinement Target | |||||
| Overall B Value | 50 | ||||
| Fitting Procedure | |||||
| Details | The model was based on individual models from this study: octameric nucleosome and Pol II. The models were rigid-body fit into the composite structure ... | ||||
| 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 | 4197404 | Initially, nearly 15 million particles were picked from micrographs. However, the number of particles cited here (4,197,404) is the starting number of particles after initial cleanup and 3D classification of the data representing Pol II and nucleosome subsets, respectively. | |
