8VE4

Unliganded human transthyretin in the frayed conformation

ELECTRON MICROSCOPY

Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	3.6941
f_angle_d	0.484
f_chiral_restr	0.0452
f_plane_restr	0.0056
f_bond_d	0.0023

Sample
Transthyretin

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	HOMEMADE PLUNGER
Cryogen Name	ETHANE
Sample Vitrification Details	3 uL of sample were applied onto the graphene side of the grid after it was mounted on the plunger (always at the same height), and immediately blotte ...	3 uL of sample were applied onto the graphene side of the grid after it was mounted on the plunger (always at the same height), and immediately blotted for 4 seconds by holding a 1 x 6 cm piece of Whatman 1 filter paper parallel to the grid, in full contact. Timing was kept with the help of a metronome. The blotting countdown was started after the blotted liquid spot on the filter paper stopped spreading and the grid was plunged in liquid ethane at the same time the blotting paper was pulled back, in a single motion.

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	202700
Reported Resolution (Å)	3.3
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

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

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	52

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TALOS ARCTICA
Minimum Defocus (nm)	500
Maximum Defocus (nm)	1500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	73000
Calibrated Magnification	88968
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.19.2_4158:
IMAGE ACQUISITION	Leginon	3.6
RECONSTRUCTION	RELION	3.1

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

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 R01GM133198.