ELECTRON MICROSCOPY

Sample

AngV-F protein trimer in pre-fusion conformation

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument LEICA EM GP
Cryogen Name ETHANE
Sample Vitrification Details Protein sample was applied to the grid and incubated for 30 seconds at >95% humidity. Excess protein was blotted away for 2.5 seconds before being plunge frozen into liquid ethane
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 1106722
Reported Resolution (Å) 4.03
Resolution Method FSC 0.143 CUT-OFF
Other Details Non-uniform refinement used for the final reconstruction
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 28
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 1700
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 81000
Calibrated Magnification 81000
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Grid screening was performed manually
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC v4.5.3
CTF CORRECTION cryoSPARC v4.5.3
MODEL FITTING UCSF ChimeraX 1.6.1
CLASSIFICATION cryoSPARC v4.5.3
RECONSTRUCTION cryoSPARC v4.5.3
MODEL REFINEMENT PHENIX 1.21.1_5286
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
NONE Micrographs were curated through contrast transfer function (CTF) where greater than 30 angstrom were discarded