9F59

Poliovirus type 2 (strain MEF-1) stabilised virus-like particle (PV2 SC6b) from a mammalian expression system.


ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1EAH 

Refinement

RMS Deviations
KeyRefinement Restraint Deviation
f_dihedral_angle_d11.451
f_angle_d0.502
f_chiral_restr0.043
f_plane_restr0.004
f_bond_d0.002
Sample
Poliovirus 2
Specimen Preparation
Sample Aggregation StatePARTICLE
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE-PROPANE
Sample Vitrification Details4 ul of sample blotted for 3.5 seconds with -15 blot force on FEI Vitrobot mark IV.
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles18378
Reported Resolution (Å)2.3
Resolution MethodFSC 0.143 CUT-OFF
Other DetailsIcosahedral symmetry applied to final reconstruction. Final maps were post-processed with an inverse B-factor of -67.7 Angstrom squared.
Refinement Type
Symmetry TypePOINT
Point SymmetryI
Map-Model Fitting and Refinement
Id1 (1EAH)
Refinement SpaceREAL
Refinement ProtocolRIGID BODY FIT
Refinement TargetCross-correlation coefficient
Overall B Value
Fitting Procedure
DetailsInitial model was rigid body fitted using UCSF chimera and Coot. Global minimization and B-factor refinement was performed in real space using pheni ...
Data Acquisition
Detector TypeGATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)39.08
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelFEI TITAN KRIOS
Minimum Defocus (nm)800
Maximum Defocus (nm)2900
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS2.7
Imaging ModeDARK FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification
Calibrated Magnification47393
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging DetailsPreliminary grid screening was performed on a Glacios 200 kV microscope.
EM Software
TaskSoftware PackageVersion
PARTICLE SELECTIONcryoSPARC4.2.1
CTF CORRECTIONcryoSPARC4.2.1
MODEL FITTINGUCSF Chimera1.16
MODEL FITTINGCoot0.9.6
INITIAL EULER ASSIGNMENTcryoSPARC4.2.1
FINAL EULER ASSIGNMENTcryoSPARC4.2.1
CLASSIFICATIONcryoSPARC4.2.1
RECONSTRUCTIONcryoSPARC4.2.1
MODEL REFINEMENTPHENIX1.20.1_4487-000
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTIONCTF correction performed using the Patch CTF job in cryoSPARC.18864Particle picking was performed using the template picker in CryoSPARC.