ELECTRON MICROSCOPY

Sample

Pre-translocation ribosome bound to A/P, P/E hybrid state tRNA

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK II
Cryogen Name ETHANE
Sample Vitrification Details Freshly glow-disharged grids were loaded into an FEI Mark II Vitrobot and equilibrated to 95% relative humidity at 22 degrees Celsius. 2 microliters of sample was applied through the side port, blotted for 7 seconds with a positional offset of 2, and plunged into liquid ethane.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 85115
Reported Resolution (Å) 7.6
Resolution Method FSC 0.143 CUT-OFF
Other Details Refinement included data to 12 Angstrom resolution to limit FSC bias. See primary citation Supplementary Information for details. (Single particle details: Refinement and 3D classification performed by Frealign) (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--Chain Y not used in refinement
Data Acquisition
Detector Type FEI FALCON I (4k x 4k)
Electron Dose (electrons/Å2) 30
Imaging Experiment
Date of Experiment 2012-11-02
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1150
Maximum Defocus (nm) 6950
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 134615
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