ELECTRON MICROSCOPY

Sample

18-mer ring cryoEM structure of the 80a-Sak NTD in apo state

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 75703
Reported Resolution (Å) 3.21
Resolution Method FSC 0.143 CUT-OFF
Other Details Symmetry expanded to C18, multiplying the stack by 18, from 75703 to 1365300 particles.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details Fitting of the truncated AlphaFold prediction was done with ChimeraX and then subjected to real space refinement in PHENIX. The output was then repeatedly adjusted with Coot and verified in 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 GLACIOS
Minimum Defocus (nm) 1600
Maximum Defocus (nm) 2900
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 190000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 4.2.1
IMAGE ACQUISITION EPU 2.13.0
CTF CORRECTION cryoSPARC 4.2.1
MODEL FITTING UCSF ChimeraX 1.4
MODEL REFINEMENT PHENIX 1.20.1
MODEL REFINEMENT Coot 0.9.8.4 EL
INITIAL EULER ASSIGNMENT cryoSPARC 4.2.1
FINAL EULER ASSIGNMENT cryoSPARC 4.2.1
RECONSTRUCTION cryoSPARC 4.2.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION CTF correction was applied on-the-fly during data collection with CryoSPARC Live.