Single particle cryo-EM structure of the voltage-gated K+ channel Eag1 bound to the channel inhibitor calmodulin
ELECTRON MICROSCOPY
Refinement
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| r_dihedral_angle_2_deg | 30.68 |
| r_long_range_B_refined | 29.639 |
| r_long_range_B_other | 29.638 |
| r_scangle_other | 26.614 |
| r_scbond_it | 19.895 |
| r_scbond_other | 19.891 |
| r_mcangle_it | 16.95 |
| r_mcangle_other | 16.949 |
| r_dihedral_angle_3_deg | 15.408 |
| r_dihedral_angle_4_deg | 12.017 |
| Sample |
|---|
| Voltage-gated K+ channel Eag1 bound to the channel inhibitor calmodulin |
| Sample Components |
| Voltage-gated potassium channel Eag1 |
| Calmodulin |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK IV |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | Plunged into liquid ethane (FEI VITROBOT MARK IV) |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 145000 |
| Reported Resolution (Å) | 3.78 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | 2D classification, 3D classification, and refinement were performed in RELION. Final map generation was performed in FREALIGN. |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C4 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 | ||||
| Refinement Space | RECIPROCAL | ||||
| Refinement Protocol | AB INITIO MODEL | ||||
| Refinement Target | |||||
| Overall B Value | |||||
| Fitting Procedure | |||||
| Details | |||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | GATAN K2 SUMMIT (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 1.8 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | FEI TITAN KRIOS |
| Minimum Defocus (nm) | 1500 |
| Maximum Defocus (nm) | 3000 |
| 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) | 300 |
| Imaging Details |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| PARTICLE SELECTION | RELION | 1.4 |
| CTF CORRECTION | CTFFIND4 | 4 |
| MODEL FITTING | Coot | |
| INITIAL EULER ASSIGNMENT | RELION | 1.4 |
| FINAL EULER ASSIGNMENT | RELION | 1.4 |
| FINAL EULER ASSIGNMENT | FREALIGN | |
| RECONSTRUCTION | FREALIGN | |
| MODEL REFINEMENT | REFMAC | |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| PHASE FLIPPING AND AMPLITUDE CORRECTION | 240000 | Particles were auto-picked and manually inspected in RELION. | ||
