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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).