ELECTRON MICROSCOPY

Sample

Beta-amyloid protein 42 fibrils

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details 2.5 microL sample was applied to the grid, blotted for 2.5 s before plunging.
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 127765
Reported Resolution (Å) 4.0
Resolution Method FSC 0.143 CUT-OFF
Other Details For the even/odd test, the fibrils were split after the final reconstruction (no gold-standard). These two half sets were then refined further independently for another 12 iterations.
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol AB INITIO MODEL
Refinement Target Cross-correlation coefficient
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type FEI FALCON III (4k x 4k)
Electron Dose (electrons/Å2) 24
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TECNAI ARCTICA
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 ?
Nominal Magnification 110000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION EPU 1.8.0.1533
CTF CORRECTION SPARX 4.0
INITIAL EULER ASSIGNMENT SPARX 4.0
FINAL EULER ASSIGNMENT SPARX 4.0
RECONSTRUCTION SPARX 4.0
MODEL REFINEMENT PHENIX 1.11.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?