6TU3

Rat 20S proteasome

ELECTRON MICROSCOPY

Sample
Rat liver 20S proteasome

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	blot for 3 seconds

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	245800
Reported Resolution (Å)	2.7
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C2

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

Data Acquisition
Detector Type	GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å**2)	37

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	600
Maximum Defocus (nm)	1600
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	DIFFRACTION
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	105000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	Preliminary grid screening was performed on Talos Arctica

EM Software
Task	Software Package	Version
PARTICLE SELECTION	RELION	3.0
IMAGE ACQUISITION	EPU	2.0
CTF CORRECTION	CTFFIND	4
INITIAL EULER ASSIGNMENT	RELION	3.0
FINAL EULER ASSIGNMENT	RELION	3.0
RECONSTRUCTION	RELION	3.0

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		284161

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.