3J9C

CryoEM single particle reconstruction of anthrax toxin protective antigen pore at 2.9 Angstrom resolution

ELECTRON MICROSCOPY

Sample
Heptamer of C-terminal 63-kDa fragment of anthrax toxin protective antigen, pore conformation
Sample Components
Anthrax toxin protective antigen

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	Plunged into liguid nitrogen (FEI VITROBOT MARK IV).

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	60455
Reported Resolution (Å)	2.9
Resolution Method	FSC 0.143 CUT-OFF
Other Details	(Single particle--Applied symmetry: C7)
Refinement Type
Symmetry Type	POINT
Point Symmetry	C7

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 (4k x 4k)
Electron Dose (electrons/Å**2)	30

Imaging Experiment	1
Date of Experiment	2014-01-08
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1800
Maximum Defocus (nm)	5100
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	22500
Calibrated Magnification	39062
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
RECONSTRUCTION	RELION

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	Each particle

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.