ELECTRON MICROSCOPY

Sample

Cryo-EM map of a complex including RNA polymerase II, Mediator Head module, TFIIF, TFIIB, TBP, and promoter DNA

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details Blot for approximately 2 seconds before plunging into liquid ethane.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 51000
Reported Resolution (Å) 16
Resolution Method FSC 0.5 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details REFINEMENT PROTOCOL--Rigid body fitting of individual RNA polymerase II structural modules DETAILS--Fitted individual structural modules previously identified by X-ray crystallographic studies of RNA polymerase II under different crystallization conditions
Data Acquisition
Detector Type TVIPS TEMCAM-F415 (4k x 4k)
Electron Dose (electrons/Å2) 10
Imaging Experiment
Date of Experiment 2008-07-30
Temprature (Kelvin)
Microscope Model FEI TECNAI F20
Minimum Defocus (nm) 800
Maximum Defocus (nm) 3800
Minimum Tilt Angle (degrees) 0.0
Maximum Tilt Angle (degrees) 0.0
Nominal CS 2.0
Imaging Mode BRIGHT FIELD
Specimen Holder Model GATAN LIQUID NITROGEN
Nominal Magnification 50000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 120
Imaging Details ?
Imaging Experiment
Task Software Package Version
MODEL FITTING OTHER ?
RECONSTRUCTION SPARX ?
RECONSTRUCTION SPIDER ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
. Each CCD frame