ELECTRON MICROSCOPY

Sample

COXSACKIEVIRUS B3(M STRAIN) WITH ITS CELLULAR RECEPTOR

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument ?
Cryogen Name ?
Sample Vitrification Details CVB3 WAS INCUBATED WITH CAR SAMPLE FOR 1 HOURS AT 25 DEGREES CELSIUS (298 KELVIN) USING A FOUR-FOLD EXCESS OF CAR 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.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 635
Reported Resolution (Å) 22
Resolution Method OTHER
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.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol OTHER
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details METHOD--Acta Cryst. D56, 1341 REFINEMENT PROTOCOL--EMFIT DETAILS--THE DIFFERENCE MAP BETWEEN CVB3-CAR COMPLEX AND NATIVE CVB WAS CALCULATED AND THEN FITTED WITH THE N-TERMINAL DOMAIN OF CAR (1KAC, B-CHAIN). THE AUTOMATIC FITTING WAS DONE USI PROGRAM EMFIT DESCRIBED IN ACTA CRYST. D56, 1341-1349. THE CRYSTAL STRUCTURE OF POLIOVIRUS WAS PLACED INTO THE
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 20
Imaging Experiment
Date of Experiment 2000-06-01
Temprature (Kelvin)
Microscope Model FEI/PHILIPS CM300FEG/T
Minimum Defocus (nm) 1500
Maximum Defocus (nm) 4600
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model .
Nominal Magnification 61000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details