3J4S

Helical Model of TubZ-Bt four-stranded filament


ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 2XKA 
experimental modelPDB 2XKB 
Sample
TubZ-Bt
Specimen Preparation
Sample Aggregation StateFILAMENT
Vitrification InstrumentFEI VITROBOT MARK III
Cryogen NameETHANE
Sample Vitrification DetailsAdd GTP to grow filaments for 6 minutes before application to grid. Blot 4.5 seconds before plunging into liquid ethane (FEI VITROBOT MARK III).
3D Reconstruction
Reconstruction MethodHELICAL
Number of Particles
Reported Resolution (Å)6.8
Resolution MethodFSC 0.143 CUT-OFF
Other DetailsFinal map has been low-pass filtered to 7 Angstrom and high-pass filtered to 30 Angstrom. A B-factor of -309 Angstrom was applied using the program bf ...Final map has been low-pass filtered to 7 Angstrom and high-pass filtered to 30 Angstrom. A B-factor of -309 Angstrom was applied using the program bfactor. A cylindrical mask of radius ~80 Angstrom has been applied.
Refinement Type
Symmetry TypeHELICAL
Axial SymmetryC4
Axial Rise43.54512
Angular Rotation31.78843
Map-Model Fitting and Refinement
Id1 (2XKA, 2XKB)
Refinement SpaceREAL
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
DetailsDETAILS--Initial local fitting was done using Chimera and then Molecular Dynamics Flexible Fitting (MDFF) was used for flexible fitting.
Data Acquisition
Detector TypeTVIPS TEMCAM-F816 (8k x 8k)
Electron Dose (electrons/Å**2)20
Imaging Experiment1
Date of Experiment2011-04-22
Temperature (Kelvin)
Microscope ModelFEI TECNAI F20
Minimum Defocus (nm)800
Maximum Defocus (nm)3500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS2.2
Imaging ModeBRIGHT FIELD
Specimen Holder ModelOTHER
Nominal Magnification62000
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)200
Imaging Details
EM Software
TaskSoftware PackageVersion
MODEL FITTINGMDFF
RECONSTRUCTIONSPIDER
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
Whole Micrograph