ELECTRON MICROSCOPY

Sample

Structure of the Transcription Elongation Complex of Human Mitochondrial Polymerase with the Closed Conformation of the Fingers Domain

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 2457845
Reported Resolution (Å) 2.54
Resolution Method FSC 0.143 CUT-OFF
Other Details Non-uniform Refinement (CryoSPARC) which is an algorithm based on cross-validation optimization, which automatically regularizes 3D density maps during refinement to account for spatial variability.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target Cross-correlation Coefficient
Overall B Value 45
Fitting Procedure ?
Details Initial Fitting was done in Chimera and flexible/refined fitting done with Coot Phenix Real-Space Refinement.
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 50.6
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 500
Maximum Defocus (nm) 1800
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 105000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Preliminary grid screening performed manually using TFS Glacios.
Imaging Experiment
Task Software Package Version
MODEL REFINEMENT PHENIX 1.21rc1_5015:
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?