3J4T

Helical model of TubZ-Bt two-stranded filament

ELECTRON MICROSCOPY

Sample
TubZ-Bt

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	FEI VITROBOT MARK III
Cryogen Name	ETHANE
Sample Vitrification Details	TubZ was preheated at 37 degrees and polymerization was initiated with saturating GTPgammaS. TubZ was then incubated for 30 seconds at room temperatur ...	TubZ was preheated at 37 degrees and polymerization was initiated with saturating GTPgammaS. TubZ was then incubated for 30 seconds at room temperature before sample application, 4.5 second blotting, and plunge-freezing into liquid ethane (FEI VITROBOT MARK III).

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles
Reported Resolution (Å)	10.8
Resolution Method	FSC 0.143 CUT-OFF
Other Details	Final map has been low-pass filtered to 11 Angstrom and high-pass filtered to 35 Angstrom. A B-factor of -452 Angstrom was applied using the program b ...	Final map has been low-pass filtered to 11 Angstrom and high-pass filtered to 35 Angstrom. A B-factor of -452 Angstrom was applied using the program bfactor. A cylindrical mask of radius ~78 Angstrom has been applied.
Refinement Type
Symmetry Type	HELICAL
Axial Symmetry	C1
Axial Rise	22.04811
Angular Rotation	-168.15849

Map-Model Fitting and Refinement
Id	1 (2XKA)
Refinement Space	REAL
Refinement Protocol	OTHER
Refinement Target
Overall B Value
Fitting Procedure
Details	METHOD--Chimera DETAILS--Just local fitting done with Chimera

Data Acquisition
Detector Type	TVIPS TEMCAM-F816 (8k x 8k)
Electron Dose (electrons/Å**2)	20

Imaging Experiment	1
Date of Experiment	2010-05-26
Temperature (Kelvin)
Microscope Model	FEI TECNAI F20
Minimum Defocus (nm)	1500
Maximum Defocus (nm)	4500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.2
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	OTHER
Nominal Magnification	62000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
MODEL FITTING	UCSF Chimera
RECONSTRUCTION	SPIDER

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	Whole Micrograph

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.