6MST

Cryo-EM structure of human AA amyloid fibril

ELECTRON MICROSCOPY

Sample
human AA amyloid fibril

Specimen Preparation
Sample Aggregation State	HELICAL ARRAY
Vitrification Instrument	FEI VITROBOT MARK III
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles	91872
Reported Resolution (Å)	2.7
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	HELICAL
Axial Symmetry	C1
Axial Rise	2.4
Angular Rotation	0.79

Map-Model Fitting and Refinement
Id	1
Refinement Space
Refinement Protocol	AB INITIO MODEL
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	40

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	-500
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	130000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	RELION	2.1
IMAGE ACQUISITION	SerialEM	3.5
CTF CORRECTION	Gctf	1.06
MODEL FITTING	PHENIX	1.14-3219
INITIAL EULER ASSIGNMENT	RELION	2.1
FINAL EULER ASSIGNMENT	RELION	2.1
CLASSIFICATION	RELION	2.1
RECONSTRUCTION	RELION	2.1
MODEL REFINEMENT	PHENIX	1.14-3219

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		93025

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.