3J31

Life in the extremes: atomic structure of Sulfolobus Turreted Icosahedral Virus

ELECTRON MICROSCOPY

Sample
Mature Sulfolobus Turreted Icosahedral Virus

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	HOMEMADE PLUNGER
Cryogen Name	ETHANE
Sample Vitrification Details	Vitrification carried out at room temperature using liquid ethane and a homemade plunger

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	8903
Reported Resolution (Å)	4.5
Resolution Method	FSC 0.143 CUT-OFF
Other Details	The final reconstruction was sharpened with a negative temperature factor of 400A2 (Single particle--Applied symmetry: I) Resolution method was FSC a ...	The final reconstruction was sharpened with a negative temperature factor of 400A2 (Single particle--Applied symmetry: I) Resolution method was FSC at 0.143 cut-off. The reported resolution is for the entire reconstruction. The resolution of the coat subunit region (B345) is estimated to 3.9 A using the same criterion.
Refinement Type
Symmetry Type	POINT
Point Symmetry	I

Map-Model Fitting and Refinement
Id	1 (2BBD)	2 (4IL7)
Refinement Space	RECIPROCAL	RECIPROCAL
Refinement Protocol	FLEXIBLE FIT	FLEXIBLE FIT
Refinement Target
Overall B Value
Fitting Procedure
Details	REFINEMENT PROTOCOL--positional (xyz) minimization and isotropic B factor refinement DETAILS--Real space refinement was also carried out using Coot.	REFINEMENT PROTOCOL--positional (xyz) minimization and isotropic B factor refinement DETAILS--Real space refinement was also carried out using Coot. ...	REFINEMENT PROTOCOL--positional (xyz) minimization and isotropic B factor refinement DETAILS--Real space refinement was also carried out using Coot. Only the N-terminal domain was refined using CNS (residues 3-134). The C-terminal domain (residues 135-222) was only rigid-body fit using Coot and an arbitrary B-factor value of 150 A2 was assigned to it.

Data Acquisition
Detector Type	FEI FALCON I (4k x 4k)
Electron Dose (electrons/Å**2)	18

Imaging Experiment	1
Date of Experiment	2011-03-30
Temperature (Kelvin)	90
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	800
Maximum Defocus (nm)	2500
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
Calibrated Magnification	102189
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	Nanoprobe mode was used.

EM Software
Task	Software Package	Version
MODEL FITTING	CNS
RECONSTRUCTION	FREALIGN

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 National Science Foundation (DBI-1832184), 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.