1Q5B

lambda-shaped TRANS and CIS interactions of cadherins model based on fitting C-cadherin (1L3W) to 3D map of desmosomes obtained by electron tomography


ELECTRON MICROSCOPY
Sample
SKIN
Sample Components
desmosome
Specimen Preparation
Sample Aggregation StateTISSUE
Vitrification Instrument
Cryogen NameNITROGEN
Sample Vitrification Detailshigh pressure frozen and freezing substituted with 1% OsO4/0.1% Ur-Ac. in acetone, LX-112 resin embeded sample. 50nm thin section
3D Reconstruction
Reconstruction MethodTOMOGRAPHY
Number of Particles
Reported Resolution (Å)30
Resolution Method
Other Detailssectioned sample thickness 47.2 nm; +/- 75 degree dual-axis tilt-series with increment 1 degree, dual-axis electron tomography with IMOD. 1.169nm al ...sectioned sample thickness 47.2 nm; +/- 75 degree dual-axis tilt-series with increment 1 degree, dual-axis electron tomography with IMOD. 1.169nm alignment error
Refinement Type
Symmetry TypePOINT
Point SymmetryC1
Map-Model Fitting and Refinement
Id1 (1L3W)
Refinement SpaceREAL
Refinement ProtocolRIGID BODY FIT
Refinement Targetbest visual fit using the program AmiraMOL 3.0
Overall B Value
Fitting Procedure
DetailsMETHOD--tracking 3D density REFINEMENT PROTOCOL--rigid body
Data Acquisition
Detector TypeGENERIC GATAN
Electron Dose (electrons/Å**2)1200
Imaging Experiment1
Date of Experiment2002-11-23
Temperature (Kelvin)295
Microscope ModelFEI/PHILIPS CM200FEG
Minimum Defocus (nm)300
Maximum Defocus (nm)500
Minimum Tilt Angle (degrees)-78
Maximum Tilt Angle (degrees)79
Nominal CS2
Imaging ModeBRIGHT FIELD
Specimen Holder Model
Nominal Magnification50000
Calibrated Magnification68276
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)200
Imaging DetailsDose is for whole dataset, not individual images
EM Software
TaskSoftware PackageVersion
RECONSTRUCTIONIMOD
MODEL FITTINGAmira3
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
no CTF correction. Imaging at underfocus 0.4 micron with CM200FEG microscope at 50,000 magnification