ELECTRON MICROSCOPY

Sample

ribosome-IRES complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK II
Cryogen Name ETHANE
Sample Vitrification Details Fresh glow discharge, 7 second blot before plunging into liquid ehtane (FEI VITROBOT MARK II).
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 51373
Reported Resolution (Å) 6.1
Resolution Method FSC 0.143 CUT-OFF
Other Details (Single particle--Applied symmetry: C1)
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target Cross-correlation
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--rigid body DETAILS--(1) TSV IRES was modeled with iFoldRNA and ModeRNA programs and then fitted into the cryo-EM map in Chimera. (2) The 80S-IRES complex was refined against the map, using stereochemically restrained real-space refinement in RSRef.
Data Acquisition
Detector Type FEI FALCON I (4k x 4k)
Electron Dose (electrons/Å2) 30
Imaging Experiment
Date of Experiment 2012-12-26
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1150
Maximum Defocus (nm) 6530
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 0.01
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 133333
Calibrated Magnification 132138
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
CTF CORRECTION CTFFIND 3
MODEL FITTING CNS ?
MODEL FITTING UCSF Chimera ?
RECONSTRUCTION EMAN 2
RECONSTRUCTION FREALIGN ?
RECONSTRUCTION IMAGIC ?
RECONSTRUCTION RSAMPLE ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. CTFFIND3, FREALIGN per micrograph