ELECTRON MICROSCOPY

Sample

HIV-2 capsid protein assembled into a lattice via lipid templating.

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Grids were dual-side blotted with blot force 0 for 5.5 sec before plunge freezing in liquid ethane.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 74821
Reported Resolution (Å) 1.98
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target Cross-correlation coefficient
Overall B Value ?
Fitting Procedure ?
Details An HIV-1 CA chain from pentamers (PDB: 8CKW) was initially fit into the density by rigid body fitting. It was then mutated to match the HIV-2 sequence, with unmodeled residues being replaced before flexible fitting and refinement into the map volume.
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 800
Maximum Defocus (nm) 2000
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 ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC ?
IMAGE ACQUISITION EPU ?
CTF CORRECTION cryoSPARC ?
MODEL FITTING Coot ?
MODEL REFINEMENT Coot ?
INITIAL EULER ASSIGNMENT cryoSPARC ?
FINAL EULER ASSIGNMENT cryoSPARC ?
CLASSIFICATION cryoSPARC ?
RECONSTRUCTION cryoSPARC ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?