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Cryo-EM structure of sarkosyl insoluble amyloid-beta 42 filaments extracted from human brain tissue
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 7Q4B
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 5.246 f_angle_d 0.486 f_chiral_restr 0.064 f_bond_d 0.006 f_plane_restr 0.001
Sample Human Amyloid-Beta Peptide (1-42) filaments
Specimen Preparation Sample Aggregation State FILAMENT Vitrification Instrument Cryogen Name NITROGEN Sample Vitrification Details
3D Reconstruction Reconstruction Method HELICAL Number of Particles 80229 Reported Resolution (Å) 3 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type HELICAL Axial Symmetry C1 Axial Rise 2.37 Angular Rotation 178.5
Map-Model Fitting and Refinement Id 1 (7Q4B) Refinement Space REAL Refinement Protocol OTHER Refinement Target Overall B Value 82.04 Fitting Procedure Details
Data Acquisition Detector Type GATAN K3 (6k x 4k) Electron Dose (electrons/Å**2) 42
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 1250 Maximum Defocus (nm) 2500 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 2.7 Imaging Mode BRIGHT FIELD Specimen Holder Model Nominal Magnification 81000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION RELION 4.0 IMAGE ACQUISITION SerialEM CTF CORRECTION RELION 4.0 MODEL FITTING UCSF Chimera MODEL REFINEMENT PHENIX INITIAL EULER ASSIGNMENT RELION 4.0 FINAL EULER ASSIGNMENT RELION 4.0 CLASSIFICATION RELION 4.0 RECONSTRUCTION RELION 4.0
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 575508