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Cryo-EM structure of human islet amyloid polypeptide (hIAPP, or amylin) fibrils seeded by patient extracted fibrils, polymorph 3
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 6Y1A
Specimen Preparation Sample Aggregation State FILAMENT Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method HELICAL Number of Particles 17853 Reported Resolution (Å) 4 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type HELICAL Axial Symmetry C1 Axial Rise 2.4 Angular Rotation 178.33
Map-Model Fitting and Refinement Id 1 (6Y1A) Refinement Space REAL Refinement Protocol AB INITIO MODEL Refinement Target Overall B Value 83 Fitting Procedure Details
Data Acquisition Detector Type GATAN K3 (6k 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 Imaging Mode BRIGHT FIELD Specimen Holder Model Nominal Magnification Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version IMAGE ACQUISITION SerialEM CTF CORRECTION CTFFIND 4.1.8 INITIAL EULER ASSIGNMENT RELION 2 FINAL EULER ASSIGNMENT RELION 2 RECONSTRUCTION RELION 2 MODEL REFINEMENT PHENIX real_space_refine
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION