ELECTRON MICROSCOPY

Sample

Cryo-EM structure of the human mitochondrial RNA polymerase transcription initiation complex (POLRMT/TFB2M/DNA/RNA) without TFAM; and with a 2-mer RNA (pppGpA) and GTP poised for catalysis (pre-IC3-TFAM)

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details incubated on the grid for 5 seconds prior to double sided blotting for 3.5 seconds at force 1
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 136426
Reported Resolution (Å) 3.5
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol FLEXIBLE FIT
Refinement Target Correlation coefficient
Overall B Value 68
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type FEI FALCON IV (4k x 4k)
Electron Dose (electrons/Å2) 40
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS GLACIOS
Minimum Defocus (nm) 600
Maximum Defocus (nm) 1800
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model OTHER
Nominal Magnification 130000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC ?
MODEL REFINEMENT PHENIX 1.19.2_4158:
RECONSTRUCTION Coot ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
NONE ?
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