The Structure of the Actin-Smooth Muscle Myosin Motor Domain Complex in the Rigor State
ELECTRON MICROSCOPY
| Sample |
|---|
| Filamentous muscle alpha-actin decorated with the motor domain of recombinant smooth muscle myosin II motor domain expressed in Sf9 cells |
| Sample Components |
| alpha-actin |
| myosin II |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | FILAMENT |
| Vitrification Instrument | GATAN CRYOPLUNGE 3 |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | Some specimens were frozen manually using a homemade plunger. |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | HELICAL |
| Number of Particles | 85000 |
| Reported Resolution (Å) | 6 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | |
| Refinement Type | |
| Symmetry Type | HELICAL |
| Axial Symmetry | C1 |
| Axial Rise | 28.18685 |
| Angular Rotation | -166.77931 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 | ||||
| Refinement Space | REAL | ||||
| Refinement Protocol | FLEXIBLE FIT | ||||
| Refinement Target | |||||
| Overall B Value | 390.86 | ||||
| Fitting Procedure | |||||
| Details | |||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | DIRECT ELECTRON DE-20 (5k x 3k) | ||||||||
| Electron Dose (electrons/Å**2) | 60 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | FEI TITAN KRIOS |
| Minimum Defocus (nm) | 2200 |
| Maximum Defocus (nm) | 5000 |
| 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 |
| IMAGE ACQUISITION | Leginon | |
| CTF CORRECTION | CTFFIND | 3.5 |
| MODEL FITTING | Rosetta | |
| MODEL REFINEMENT | Rosetta | |
| INITIAL EULER ASSIGNMENT | RELION | 1.2 |
| FINAL EULER ASSIGNMENT | RELION | 1.2 |
| CLASSIFICATION | RELION | 1.2 |
| RECONSTRUCTION | RELION | 1.2 |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| PHASE FLIPPING ONLY | 346395 | Each "particle" consisted of a filament segment masked to a length of 21.0 nm, or slightly more than 7 actin subunits with 2.76 nm separation. Adjacent filament segments overlapped by about 6 subunit repeats (approximately 84% overlap). | ||
