ELECTRON MICROSCOPY

Sample

Methanococcus jannaschii 70S ribosome-SecYEbeta complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK III
Cryogen Name ETHANE
Sample Vitrification Details Blot 1-2 seconds before plunging into liquid ethane (FEI VITROBOT MARK III).
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 37000
Reported Resolution (Å) 9.0
Resolution Method FSC 0.5 CUT-OFF
Other Details Final map calculated as an average of 6 different refinements in EMAN2 with different parameters. Resolution method was FSC at 0.5 cut-off using a comparison between experimental map and a map of the docked ribosomal models calculated at 7 Angstrom resolution with EMAN.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--FLEXIBLE
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 20
Imaging Experiment
Date of Experiment 2008-04-10
Temprature (Kelvin)
Microscope Model FEI TECNAI F20
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 2500
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.0
Imaging Mode BRIGHT FIELD
Specimen Holder Model GATAN LIQUID NITROGEN
Nominal Magnification 50000
Calibrated Magnification 51000
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details Low dose imaging, data collected manually
Imaging Experiment
Task Software Package Version
MODEL FITTING MDFF ?
MODEL FITTING UCSF Chimera ?
RECONSTRUCTION EMAN 1
RECONSTRUCTION EMAN 2
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. per micrograph
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