ELECTRON MICROSCOPY Experimental Data



EM Sample
Sample Vitrification Details POLIOVIRUS WAS INCUBATED WITH CD155-AP FOR 1 HOURS AT 4 DEGREES CELSIUS (277 KELVIN) USING A EIGHT-FOLD EXCESS OF CD155-AP FOR EACH OF THE SIXTY POSSIBLE BINDING SITES PER VIRION. AFTER INCUBATION, SAMPLES WERE PREPARED AS THIN LAYERS OF VITREOUS ICE AND MAINTAINED AT NEAR LIQUID NITROGEN TEMPERATURE IN THE ELECTRON MICROSCOPE WITH A GATAN 626 CRYOTRANSFER HOLDER.
Sample Aggregation State PARTICLE
Sample Reconstruction Method SINGLE PARTICLE
Name of Sample human poliovirus(serotype 1)complexed with three domain CD155
EM Data Acquisition
Date of Experiment 1999-06-01
Temperature (Kelvin) 120.0
Microscope Model FEI/PHILIPS CM200FEG
Detector Type KODAK SO-163 FILM
Minimum Defocus (nm) 1300.0
Maximum Defocus (nm) 2100.0
Minimum Tilt Angle (degrees) --
Maximum Tilt Angle (degrees) --
Nominal CS --
Imaging Mode BRIGHT FIELD
Electron Dose (electrons per Å**-2) 20.0
Illumination Mode FLOOD BEAM
Nominal Magnification 38000
Calibrated Magnification --
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 80
Imaging Details --
3D Reconstruction
Software Package(s) PURDUE PROGRAMS
Reconstruction Method(s) --
EM Image Reconstruction Statistics
Number of Particles 1156
Other Details THE RESOLUTION OF THE FINAL RECONSTRUCTED DENSITY WAS DETERMINED TO BE AT LEAST 22 ANGSTROMS, AS MEASURED BY RANDOMLY SPLITTING THE PARTICLES INTO TWO SETS AND COMPARING STRUCTURE FACTORS OBTAINED FROM SEPARATE RECONSTRUCTIONS (BAKER ET AL. 1991, BIOPHYS.J. 60, 1445-1456). THE EIGENVALUE SPECTRUM GAVE AN INDICATION OF THE RANDOMNESS OF THE DATA THAT WAS INCLUDED IN THE RECONSTRUCTION. THE COMPLETENESS OF THE DATA WAS VERIFIED IN THAT ALL EIGENVALUES EXCEEDED 1.0.
Effective Resolution 22.0
EM Map-Model Fitting and Refinement
Refinement Space Refinement Protocol Refinement Target Overall B Value Fitting Procedure Fitting Software
REAL OTHER VISUAL AGREEMENT -- -- --