ELECTRON MICROSCOPY

Sample

Classical pre-translocation state of E. coli ribosome 70S-Sec-tRNASec-fMet-tRNAfmet-SECIS mRNA complex (C)

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 130705
Reported Resolution (Å) 3.5
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol FLEXIBLE FIT
Refinement Target Maximum likelihood
Overall B Value ?
Fitting Procedure ?
Details For parts of the model exhibiting larger conformational differences and/or lower local map resolution, additional cycles of real space refinement and manual fitting were performed against experimental map filtered to lower resolution
Data Acquisition
Detector Type FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å2) 30
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 700
Maximum Defocus (nm) 2600
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 0.001
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 59000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Using a Cs-corrector from CEOS electron optical aberrations were corrected to residual phase errors of 45degree at scattering angles of >12 to 15 mrad.
Imaging Experiment
Task Software Package Version
MODEL REFINEMENT Rosetta 3.5
MODEL REFINEMENT Coot 0.8.3
MODEL REFINEMENT Rcrane 1.1
MODEL REFINEMENT PHENIX 1.10.1 & developmental
MODEL REFINEMENT PHENIX 1.10.1
RECONSTRUCTION RELION 1.3
MODEL REFINEMENT ERRASER ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING ONLY Local CTF correction, after MSA based classification and averaging of local power spectra