Cryo-EM structure of the human inward-rectifier potassium 2.1 channel (Kir2.1) - R312H mutant
ELECTRON MICROSCOPY
Starting Model(s)
| Initial Refinement Model(s) | |||
|---|---|---|---|
| Type | Source | Accession Code | Details |
| experimental model | PDB | 7ZDZ | |
Refinement
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| f_dihedral_angle_d | 6.451 |
| f_angle_d | 0.822 |
| f_chiral_restr | 0.049 |
| f_plane_restr | 0.006 |
| f_bond_d | 0.003 |
| Sample |
|---|
| Human inward-rectifier potassium 2.1 channel (Kir2.1) containing the Andersen-syndrome related mutation R312H |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK IV |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | Blotting force 0, blotting time 3s |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 146539 |
| Reported Resolution (Å) | 6 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C4 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 (7zdz) | ||||
| Refinement Space | REAL | ||||
| Refinement Protocol | FLEXIBLE FIT | ||||
| Refinement Target | |||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | |||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | FEI FALCON IV (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 40 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | TFS KRIOS |
| Minimum Defocus (nm) | 1200 |
| Maximum Defocus (nm) | 2400 |
| Minimum Tilt Angle (degrees) | |
| Maximum Tilt Angle (degrees) | |
| Nominal CS | 2.7 |
| Imaging Mode | BRIGHT FIELD |
| Specimen Holder Model | FEI TITAN KRIOS AUTOGRID HOLDER |
| Nominal Magnification | 165000 |
| Calibrated Magnification | |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 300 |
| Imaging Details | Preliminary grid screening was performed manually at a Glacios 2 microscope. |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| PARTICLE SELECTION | cryoSPARC | 4.2.1 |
| IMAGE ACQUISITION | EPU | 2.11 |
| MODEL FITTING | PHENIX | 1.20.1_4487 |
| MODEL FITTING | NAMD | 1.0 |
| MODEL REFINEMENT | PHENIX | 1.20.1_4487 |
| INITIAL EULER ASSIGNMENT | cryoSPARC | 4.2.1 |
| FINAL EULER ASSIGNMENT | cryoSPARC | 4.2.1 |
| CLASSIFICATION | cryoSPARC | 4.2.1 |
| RECONSTRUCTION | cryoSPARC | 4.2.1 |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| NONE | 2787753 | A blob picking followed by 2D classification was performed to generate templates for automated template-picking. Initially, 2,787,753 particles were selected after template-picking, which were submitted to three rounds do 2D classification to remove false picks, ice contamination and classes with unclear features. | ||
