ELECTRON MICROSCOPY

Sample

Maedi-visna virus (MVV) intasome

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details To lower salt concentration before plunge-freezing, the grids were blotted for 0.5 s, immediately hydrated with a 4-ul drop of 200 mM NaCl, 3 mM CaCl2 and 25 mM BisTris-HCl pH 6.5 and blotted again for 2.5 s followed by plunging into liquid ethane.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 128974
Reported Resolution (Å) 4.5
Resolution Method FSC 0.143 CUT-OFF
Other Details Non Uniform Refinement in cryoSPARC-2
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol OTHER
Refinement Target correlation coefficient
Overall B Value 100
Fitting Procedure ?
Details 5M0Q model was docked to new map (updated relion version and pixel size corrected) in Chimera and refined using phenix.real_space refine and interactively adjusted in coot.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI POLARA 300
Minimum Defocus (nm) 3500
Maximum Defocus (nm) 5000
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification ?
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION RELION 3.1
IMAGE ACQUISITION SerialEM ?
CTF CORRECTION CTFFIND 4
MODEL FITTING UCSF Chimera ?
MODEL REFINEMENT PHENIX ?
MODEL REFINEMENT Coot ?
FINAL EULER ASSIGNMENT RELION 3.1
CLASSIFICATION cryoSPARC 2
RECONSTRUCTION cryoSPARC 2
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?