ELECTRON MICROSCOPY

Sample

Muscle-type nicotinic acetylcholine receptor in intact synaptic membrane

Specimen Preperation
Sample Aggregation State HELICAL ARRAY
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 107524
Reported Resolution (Å) 4.7
Resolution Method FSC 0.143 CUT-OFF
Other Details The volumes for FSC determination were cut out from helical reconstructions of each class average
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value 350
Fitting Procedure ?
Details Refinement parameters were chosen to minimise changes to the original secondary structure
Data Acquisition
Detector Type FEI FALCON III (4k x 4k)
Electron Dose (electrons/Å2) 40
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1200
Maximum Defocus (nm) 2800
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 59000
Calibrated Magnification 104478
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details All images taken manually: by searching at low magnification for long straight and narrow tubes, then recording in integrating mode
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION RELION 2.1 and 3.1
IMAGE ACQUISITION DigitalMicrograph ?
CTF CORRECTION Gctf ?
MODEL FITTING DireX ?
CLASSIFICATION RELION 2.1
RECONSTRUCTION RELION 2.1
MODEL REFINEMENT DireX ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION Correction performed by standard procedure in RELION
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