ELECTRON MICROSCOPY

Sample

non-translating E coli ribosome-SECYEG channel complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details Blot 1 second before plunging into liquid ethane (HOMEMADE PLUNGER).
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 39000
Reported Resolution (Å) 9.5
Resolution Method OTHER
Other Details CTF correction was done on untilted and 30 degree tilted images. Resolution method was comparison of 3D map with calculated map of docked ribosomal components, with the second map made with EMAN at 7 Angstrom resolution.
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 2006-04-10
Temprature (Kelvin)
Microscope Model FEI TECNAI F20
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 2500
Minimum Tilt Angle (degrees) 0
Maximum Tilt Angle (degrees) 30
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 with manual data collection
Imaging Experiment
Task Software Package Version
MODEL FITTING MDFF ?
MODEL FITTING UCSF Chimera ?
RECONSTRUCTION EMAN 1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. per micrograph