6WXB

Cryo-EM Structure of Influenza Hemagglutinin (HA) Trimer Vitrified Using Back-it-up


ELECTRON MICROSCOPY

Refinement

RMS Deviations
KeyRefinement Restraint Deviation
f_dihedral_angle_d11.0826
f_angle_d1.0071
f_chiral_restr0.0802
f_bond_d0.0078
f_plane_restr0.0062
Sample
Influenza Hemagglutinin Trimer (H3N2) (A/Hong Kong/1/1968)
Specimen Preparation
Sample Aggregation StatePARTICLE
Vitrification InstrumentHOMEMADE PLUNGER
Cryogen NameETHANE-PROPANE
Sample Vitrification DetailsBack-it-up (ultrasonic specimen application and through-grid wicking in a high-speed specimen preparation device) was used
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles128305
Reported Resolution (Å)2.9
Resolution MethodFSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry TypePOINT
Point SymmetryC3
Map-Model Fitting and Refinement
Id1 (3WHE)
Refinement SpaceREAL
Refinement ProtocolRIGID BODY FIT
Refinement Target
Overall B Value
Fitting Procedure
Details
Data Acquisition
Detector TypeFEI FALCON IV (4k x 4k)
Electron Dose (electrons/Å**2)45
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelFEI TITAN KRIOS
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS2.7
Imaging ModeBRIGHT FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging Details
EM Software
TaskSoftware PackageVersion
PARTICLE SELECTIONcryoSPARC2
IMAGE ACQUISITIONEPU2.6
CTF CORRECTIONcryoSPARC2
MODEL FITTINGUCSF Chimera1.13
INITIAL EULER ASSIGNMENTcryoSPARC2
FINAL EULER ASSIGNMENTcryoSPARC2
RECONSTRUCTIONcryoSPARC2
MODEL REFINEMENTCoot0.8
MODEL REFINEMENTPHENIX1.17
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION378143