ELECTRON MICROSCOPY

Sample

bare actin filament

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument LEICA EM GP
Cryogen Name ETHANE
Sample Vitrification Details Sample was applied to a glow-discharged holey carbon grid, incubated for 60 seconds and blotted for 3 seconds from the backside with filter paper.
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 63139
Reported Resolution (Å) 5.5
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value 350
Fitting Procedure ?
Details Initial models were assembled from 8 actins (3J8A) through rigid body docking in Chimera, followed by flexible fitting with DireX. Resulting models were subjected to MDFF.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 1.5
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TECNAI 20
Minimum Defocus (nm) 1500
Maximum Defocus (nm) 3000
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2
Imaging Mode BRIGHT FIELD
Specimen Holder Model GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER
Nominal Magnification 29000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION Appion ?
IMAGE ACQUISITION Leginon ?
CTF CORRECTION CTFFIND 3
CTF CORRECTION FREALIGN 9.11
MODEL FITTING DireX ?
MODEL FITTING MDFF ?
MODEL FITTING NAMD ?
MODEL REFINEMENT MDFF ?
INITIAL EULER ASSIGNMENT EMAN2 ?
INITIAL EULER ASSIGNMENT SPARX ?
FINAL EULER ASSIGNMENT FREALIGN 9.11
RECONSTRUCTION FREALIGN 9.11
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?