6BIH
The Structure of the Actin-Smooth Muscle Myosin Motor Domain Complex in the Rigor State
ELECTRON MICROSCOPY
Sample |
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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 | |
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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 | |
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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 | |||||
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Id | 1 | ||||
Refinement Space | REAL | ||||
Refinement Protocol | FLEXIBLE FIT | ||||
Refinement Target | |||||
Overall B Value | 390.86 | ||||
Fitting Procedure | |||||
Details |
Data Acquisition | |||||||||
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Detector Type | DIRECT ELECTRON DE-20 (5k x 3k) | ||||||||
Electron Dose (electrons/Å**2) | 60 |
Imaging Experiment | 1 |
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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 | ||
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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 | ||||
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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). |