9GU3

ELECTRON MICROSCOPY

Sample

Human adult muscle nAChR in desensitised state in nanodisc with 1 mM 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=4 s, blot force=-10
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 434976
Reported Resolution (Å) 2.64
Resolution Method FSC 0.143 CUT-OFF
Other Details non-uniform refinenement
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 GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 2200
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 ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 4.4.1
CTF CORRECTION cryoSPARC 4.4.1
MODEL FITTING UCSF ChimeraX 1.6.1
MODEL FITTING Coot 0.9.8
MODEL FITTING ISOLDE ?
INITIAL EULER ASSIGNMENT cryoSPARC 4.4.1
FINAL EULER ASSIGNMENT cryoSPARC 4.4.1
CLASSIFICATION RELION 5.0.0
RECONSTRUCTION cryoSPARC 4.4.1
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 ?