ELECTRON MICROSCOPY

Sample

Human adult muscle nAChR in resting state in detergent with alpha-bungarotoxin

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details blot time 2s, blot force -10
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 31022
Reported Resolution (Å) 2.96
Resolution Method FSC 0.143 CUT-OFF
Other Details Non-uniform refinement
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details Initial fitting of alphafold models using chimeraX followed by manual rebuilding in COOT and final refinement in ISOLDE and PHENIX
Data Acquisition
Detector Type TFS FALCON 4i (4k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 1200
Maximum Defocus (nm) 2400
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 130000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details objective aperture 70 um
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 3.3.1
IMAGE ACQUISITION EPU ?
CTF CORRECTION cryoSPARC 3.3.1
MODEL FITTING UCSF ChimeraX 1.6.1
MODEL FITTING Coot 0.9.8
MODEL FITTING ISOLDE ?
INITIAL EULER ASSIGNMENT cryoSPARC 3.3.1
FINAL EULER ASSIGNMENT cryoSPARC 3.3.1
CLASSIFICATION RELION 3.1.3
RECONSTRUCTION cryoSPARC 3.3.1
MODEL REFINEMENT PHENIX 1.21.1_5286
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?