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CryoEM structure of the MDA5-dsRNA filament with 74-degree helical twist
Sample MDA5-dsRNA helical filament Sample Components MDA5 bound to AMPPNP Double-stranded RNA from bacteriophage Phi6
Specimen Preparation Sample Aggregation State HELICAL ARRAY Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method HELICAL Number of Particles 33138 Reported Resolution (Å) 3.68 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type HELICAL Axial Symmetry C1 Axial Rise 42.8438 Angular Rotation 74.3022
Map-Model Fitting and Refinement Id 1 Refinement Space REAL Refinement Protocol FLEXIBLE FIT Refinement Target Cross-correlation coefficient Overall B Value 175 Fitting Procedure Details
Data Acquisition Detector Type FEI FALCON III (4k x 4k) Electron Dose (electrons/Å**2) 29.85
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 1800 Maximum Defocus (nm) 2700 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS Imaging Mode BRIGHT FIELD Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER Nominal Magnification Calibrated Magnification 75000 Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION RELION 2.1.0 IMAGE ACQUISITION EPU 1.9.1 CTF CORRECTION Gctf 1.06 MODEL FITTING Coot 0.8.9 MODEL REFINEMENT PHENIX 1.13 INITIAL EULER ASSIGNMENT RELION 2.1.0 FINAL EULER ASSIGNMENT RELION 2.1.0 CLASSIFICATION RELION 2.1.0 RECONSTRUCTION RELION 2.1.0
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 367549