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Cryo-EM Structure of Influenza Hemagglutinin (HA) Trimer Vitrified Using Back-it-up
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 3WHE
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 11.0826 f_angle_d 1.0071 f_chiral_restr 0.0802 f_bond_d 0.0078 f_plane_restr 0.0062
Sample Influenza Hemagglutinin Trimer (H3N2) (A/Hong Kong/1/1968)
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument HOMEMADE PLUNGER Cryogen Name ETHANE-PROPANE Sample Vitrification Details Back-it-up (ultrasonic specimen application and through-grid wicking in a high-speed specimen preparation device) was used
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 128305 Reported Resolution (Å) 2.9 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT Point Symmetry C3
Map-Model Fitting and Refinement Id 1 (3WHE) Refinement Space REAL Refinement Protocol RIGID BODY FIT Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type FEI FALCON IV (4k x 4k) Electron Dose (electrons/Å**2) 45
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) Maximum Defocus (nm) 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 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION cryoSPARC 2 IMAGE ACQUISITION EPU 2.6 CTF CORRECTION cryoSPARC 2 MODEL FITTING UCSF Chimera 1.13 INITIAL EULER ASSIGNMENT cryoSPARC 2 FINAL EULER ASSIGNMENT cryoSPARC 2 RECONSTRUCTION cryoSPARC 2 MODEL REFINEMENT Coot 0.8 MODEL REFINEMENT PHENIX 1.17
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 378143