Cryo-EM reveals the conformation of a substrate analogue in the human 20S proteasome core
ELECTRON MICROSCOPY
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 3UNE | |
| Sample |
|---|
| HUMAN 20S PROTEASOME CORE |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK III |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | VITRIFICATION 1 -- CRYOGEN- ETHANE, HUMIDITY- 95, TEMPERATURE- 120, INSTRUMENT- FEI VITROBOT MARK III, METHOD- BLOT 2. 5 SECONDS BEFORE PLUNGING, |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 76500 |
| Reported Resolution (Å) | 3.5 |
| Resolution Method | |
| Other Details | DISORDERED REGIONS, NOT RECOVERED IN THE EM MAP, WHERE NOT MODELED. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2981. (DEPOSITION ID: 13310). |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C2 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 (3UNE) | ||||
| Refinement Space | REAL | ||||
| Refinement Protocol | FLEXIBLE FIT | ||||
| Refinement Target | |||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | METHOD--FLEXIBLE | ||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | FEI FALCON II (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 4.8 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | 2014-02-04 |
| Temperature (Kelvin) | 85 |
| Microscope Model | FEI TITAN KRIOS |
| Minimum Defocus (nm) | 1700 |
| Maximum Defocus (nm) | 3000 |
| Minimum Tilt Angle (degrees) | |
| Maximum Tilt Angle (degrees) | |
| Nominal CS | 2.7 |
| Imaging Mode | BRIGHT FIELD |
| Specimen Holder Model | |
| Nominal Magnification | 75000 |
| Calibrated Magnification | 134461 |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 300 |
| Imaging Details | EACH EXPOSURE WAS RECORDED AS 17 INDIVIDUAL FRAMES CAPTURED AT A RATE OF 0.056 SECONDS PER FRAME, WITH AN ELECTRON DOSE OF 2.8 ELECTRONS PER SQUARE ANGSTROM. DATA-SET RECORDED USING EPU SOFTWARE. |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| MODEL FITTING | Coot | |
| MODEL FITTING | PHENIX | |
| RECONSTRUCTION | IMAGIC | |
| RECONSTRUCTION | SPIDER | |
| RECONSTRUCTION | TIGRIS | |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| FULL RECORDED IMAGE | ||||
