ELECTRON MICROSCOPY

Sample

Partial yeast 48S preinitiation complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK I
Cryogen Name ETHANE
Sample Vitrification Details Blot for 2.5 seconds before plunging into liquid ethane (FEI VITROBOT MARK I)
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 29698
Reported Resolution (Å) 4.00
Resolution Method FSC 0.143 CUT-OFF
Other Details The local resolution for chains k and l (lower-case chain IDs) is worse than the rest of the map. Therefore, these chains were docked as a rigid body into an 8 Angstrom-resolution low-pass filtered map and then edited to remove clashes. The quality of this portion of the model is to be considered lower than the rest of the model.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space RECIPROCAL
Refinement Protocol FLEXIBLE FIT
Refinement Target R-factor, FSC
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--flexible
Data Acquisition
Detector Type FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å2) 28
Imaging Experiment
Date of Experiment 2013-10-28
Temprature (Kelvin)
Microscope Model FEI POLARA 300
Minimum Defocus (nm) 1600
Maximum Defocus (nm) 4000
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 78000
Calibrated Magnification 104478
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Complete dataset was collected in 5 non-consecutive days
Imaging Experiment
Task Software Package Version
MODEL FITTING REFMAC ?
MODEL FITTING UCSF Chimera ?
RECONSTRUCTION EMAN 2
RECONSTRUCTION RELION ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. Each particle