Experiment: 6TAT

Structure of the five-fold capsomer of the dArc2 capsid

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	6GSE

Sample
dArc2 Capsids

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

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	21348
Reported Resolution (Å)	3.7
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C5

Map-Model Fitting and Refinement
Id	1 (6GSE)
Refinement Space	REAL
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)	35

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	800
Maximum Defocus (nm)	3000
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	105000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
IMAGE ACQUISITION	SerialEM	3.7
IMAGE ACQUISITION	DigitalMicrograph
CTF CORRECTION	RELION	3
CTF CORRECTION	CTFFIND	4
MODEL FITTING	PHENIX	1.16
MODEL FITTING	Coot	0.8.9.1
MODEL FITTING	UCSF Chimera	1.13.1
MODEL REFINEMENT	PHENIX	1.16
INITIAL EULER ASSIGNMENT	RELION	3
FINAL EULER ASSIGNMENT	RELION	3
RECONSTRUCTION	RELION	3

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		21348	From 1779 initial dArc2 icosahedral capsids, we performed symmetry expansion as implemented in RELION, to calculate the positions and orientations for each of the 106,740 asymmetric units for dArc2, centered at the five-fold capsomeres. We extracted individual capsomeres using a box size of 148 pixels. For the five-fold capsomeres we removed the redundant five-fold symmetrized capsomeres leaving 21,348 particles.