ELECTRON MICROSCOPY Experimental Data



Virus Particulars
Virus Host Category Virus Host Species Virus Host Growth Cell Virus Type Virus Isolate ICTVDB ID
-- -- -- -- -- --
EM Sample
Sample pH 7.6
Sample Support Details sample conc. l2.0E10 PFU/ML
Sample Vitrification Details LIQUID NITROGEN TEMPERATURE 50MM TRIS-HCL, 75MM NACL, 1MM EDTA
Sample Aggregation State PARTICLE
Name of Sample DENGUE VIRUS MAJOR ENVELOPE PROTEIN E
Sample Details SAMPLES WERE PREPARED AS THIN LAYERS OF VITREOUS ICE AND MAINTAINED AT NEAR LIQUID NITROGEN TEMPERATURE IN THE ELECTRON MICROSCOPE.
EM Data Acquisition
Date of Experiment --
Num of Micrographs-Images Used 25
Temperature (Kelvin) 100.0
Microscope Model PHILLIPS CM200
Detector Type KODAK SO163 FILM
Minimum Defocus (nm) 790.0
Maximum Defocus (nm) 1920.0
Minimum Tilt Angle (degrees) 0.0
Maximum Tilt Angle (degrees) 0.0
Nominal CS 2.0
Imaging Mode BRIGHT FIELD
Electron Dose (electrons nm**-2) 25.5
Illumination Mode FLOOD BEAM LOW DOSE
Nominal Magnification 50000
Calibrated Magnification --
Source SCHOTTKY FIELD EMISSION GUN
Acceleration Voltage (kV) --
Imaging Details --
3D Reconstruction
Software Package(s)
Reconstruction Method COMMON-LINES AND POLAR-FOURIER-TRANSFORM (FULLER ET AL. 1996, J.STRUC.BIOL. 116, 48-55 BAKER AND CHENG, 1996, J.STRUC.BIOL. 116, 120-130) SOFTWARE USED, PURDUE PROGRAMS
EM Image Reconstruction Statistics
Number of Particles 526
Nominal Pixel Size 2.8
Actual Pixel Size 2.9
Effective Resolution 24.0
CTF Correction Method EACH VIRAL IMAGE WAS CTF CORRECTED BEFORE RECONSTRUCTION, BASED ON THE FOLLOWING EQUATION: F(CORR)=F(OBS)/[|CTF|+WIENER]
EM Map-Model Fitting and Refinement
Refinement Space Refinement Protocol Refinement Target Overall B Value Fitting Procedure Fitting Software
REAL -- -- -- IN THE FIRST STEP THE CRYSTAL STRUCTURE OF TBEV-E CRYSTALLOGRAPHIC DIMER (REY ET.AL., 1995 NATURELONDON) 375, 291-298) WAS ROTATED ABOUT AND TRANSLATEDAROUND AN ICOSAHEDRAL TWO FOLD AXES TO FIND THE BEST FIT. AFTER THAT THE DENSITIES AT ALL PIXELS COVERED BY THE FIRST FITTED DIMER WERE SET TO ZERO. THE SECOND DIMER WAS THAN PLACED ON A RADIAL AXIS PASSING THROUGH A POINT NEAR THE QUASI-TWOFOLD AXIS. CLIMB