ELECTRON MICROSCOPY

Sample

Human adult muscle nAChR in desensitised state in nanodisc with 100 uM acetylcholine

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details 2.5 ul sample, blot time=6 s, blot force=-10
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 175800
Reported Resolution (Å) 2.73
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) 800
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 100 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 ?