ELECTRON MICROSCOPY

Sample

Complex between Spike and nanobody H11-H4

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument SPOTITON
Cryogen Name ETHANE
Sample Vitrification Details SPT Labtech prototype 300 mesh 1.2/2.0 nanowire grids with a highly reproduceable rectangular bar cross-section were used. The grids were glow-discharged on low for 90 s (Plasma Cleaner PDC-002-CE, Harrick Plasma) to activate the nanowires. Approximately 6 nL of the complex were applied to the grids using a Chameleon EP system (SPT Labtech) at 81 % relative humidity and ambient temperature.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 126938
Reported Resolution (Å) 3.7
Resolution Method FSC 0.143 CUT-OFF
Other Details Relion
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space RECIPROCAL
Refinement Protocol RIGID BODY FIT
Refinement Target Correlation
Overall B Value ?
Fitting Procedure ?
Details REFMAC was used via ccpem GUI
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 46
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 3000
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 47170
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details EPU auto-function coma free correction
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION crYOLO ?
IMAGE ACQUISITION EPU 2.6.1
CTF CORRECTION Gctf ?
MODEL FITTING UCSF Chimera ?
INITIAL EULER ASSIGNMENT RELION 3.08
FINAL EULER ASSIGNMENT RELION 3.08
CLASSIFICATION RELION ?
RECONSTRUCTION RELION 3.08
MODEL REFINEMENT REFMAC 5
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION Relion
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