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 3J0R | pdb_00003j0r

Model of a type III secretion system needle based on a 7 Angstrom resolution cryoEM map


ELECTRON MICROSCOPY
Sample
type III secretion needle
Specimen Preparation
Sample Aggregation StateFILAMENT
Vitrification InstrumentFEI VITROBOT MARK I
Cryogen NameETHANE
Sample Vitrification DetailsBlot for 3.5 seconds before plunging into liquid ethane (Vitrobot).
3D Reconstruction
Reconstruction MethodHELICAL
Number of Particles
Reported Resolution (Å)7.7
Resolution Method
Other Details
Refinement Type
Symmetry TypeHELICAL
Axial SymmetryC1
Axial Rise4.3
Angular Rotation64.06
Map-Model Fitting and Refinement
Id1
Refinement SpaceREAL
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details
Data Acquisition
Detector TypeTVIPS TEMCAM-F415 (4k x 4k)
Electron Dose (electrons/Å**2)20
Imaging Experiment1
Date of Experiment2008-07-02
Temperature (Kelvin)50
Microscope ModelJEOL 3200FSC
Minimum Defocus (nm)1000
Maximum Defocus (nm)2000
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS1.6
Imaging ModeBRIGHT FIELD
Specimen Holder Model
Nominal Magnification50000
Calibrated Magnification89285
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)200
Imaging Details
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
CTFFIND3 Each particle