ELECTRON MICROSCOPY

Sample

Transcription factor IIH (TFIIH)

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details A thin film of continuous carbon was floated onto Protochips C-flat CF-4/2 holey carbon grids and glow discharged or plasma cleaned before application of 4 uL of sample solution.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 138659
Reported Resolution (Å) 3.7
Resolution Method FSC 0.143 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 Reference structures and homology models were docked and subsequently completely rebuilt according to the density. Parts of the structure were traced de novo.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 500
Maximum Defocus (nm) 700
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification ?
Calibrated Magnification 43478
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Residual beam tilt corrected in RELION 3.
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION SerialEM ?
CTF CORRECTION Gctf ?
CTF CORRECTION RELION 3
MODEL FITTING UCSF Chimera ?
MODEL FITTING Coot ?
MODEL FITTING O ?
INITIAL EULER ASSIGNMENT RELION 3
FINAL EULER ASSIGNMENT RELION 3
CLASSIFICATION RELION 3
RECONSTRUCTION RELION 3
MODEL REFINEMENT PHENIX ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION CTF correction during 3D reconstruction in RELION 3.