ELECTRON MICROSCOPY

Sample

Helical complex of bovine S1 cardiac myosin and human cardiac tropomyosin-decorated chicken skeletal actin filaments

Specimen Preperation
Sample Aggregation State HELICAL ARRAY
Vitrification Instrument FEI VITROBOT MARK III
Cryogen Name ETHANE
Sample Vitrification Details Thin filaments were reconstituted by first mixing F-actin and tropomyosin to final concentrations of 10 uM actin and 7 uM tropomyosin. Just before applying 1.5 uL actin-tropomyosin to a freshly glow discharged holey-carbon grid, the surfactant octyl B-D-glucopyranoside was added to the protein solution to a concentration of 12 nM. The grid sample was manually blotted for 1 second and a 1.5 uL drop of 7.5 uM myosin-S1 sub-fragment was then applied to the blotted grid sample. The sample was immediately blotted for 4 seconds and plunge-frozen in liquid ethane.
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 32158
Reported Resolution (Å) 4.24
Resolution Method FSC 0.143 CUT-OFF
Other Details Performed in the Relion post-processing step
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure flexible fitting
Details version 1.9.3; initial flexible fitting to align secondary structure using MDFF
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 53
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1500
Maximum Defocus (nm) 2500
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 130000
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION RELION 3.0.7
IMAGE ACQUISITION EPU ?
CTF CORRECTION CTFFIND 4.1
INITIAL EULER ASSIGNMENT RELION 3.0.7
FINAL EULER ASSIGNMENT RELION 3.0.7
RECONSTRUCTION RELION ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?