ELECTRON MICROSCOPY

Sample

Procapsid of the bacteriophage alpha3

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument
Cryogen Name
Sample Vitrification Details
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 2378
Reported Resolution (Å) 16.0
Resolution Method ?
Other Details 2378 particles were included in the final reconstruction. The effective resolution is 15.0-16.0A. Higher resolution was not possible because of the tendency of particles to orient themselves non-randomly. Only CA coordinates are presented in the entry.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target Best fit criterion used by the program EMfit is based on the average value of the density at all atomic sites in the fitted protein, the lack of atoms in negative density, and the absence of symmetry related atomic clashes.
Overall B Value ?
Fitting Procedure ?
Details METHOD--General search followed by a climb procedure REFINEMENT PROTOCOL--rigid molecule fit using the program EMfit
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 0.017
Imaging Experiment
Date of Experiment 1998-10-16
Temprature (Kelvin)
Microscope Model FEI/PHILIPS CM200FEG/ST
Minimum Defocus (nm) 3200
Maximum Defocus (nm) 1600
Minimum Tilt Angle (degrees) 0
Maximum Tilt Angle (degrees) 0
Nominal CS 2.0
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 38000
Calibrated Magnification 40000
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Imaging Experiment
Task Software Package Version
MODEL FITTING EMfit ?
PARTICLE SELECTION RobEM ?
RECONSTRUCTION EM3DR ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. CTF correction was done for each particle.