ELECTRON MICROSCOPY

Sample

Human nuclear exosome-MTR4 helicase captured after unwinding a DNA/RNA substrate

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details 30 sec wait time, 2.5 sec blot time
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 122703
Reported Resolution (Å) 3.45
Resolution Method FSC 0.143 CUT-OFF
Other Details Focused refinements with five strategies required to achieve final model
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol BACKBONE TRACE
Refinement Target Correlation coefficient
Overall B Value 73.6
Fitting Procedure ?
Details Models were rebuilt manually using Coot, with real space refinement with local scaling followed by Phenix real space refinement with suboptimal global scaling.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 85.23
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) ?
Maximum Defocus (nm) ?
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification ?
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION Leginon 3.2
CTF CORRECTION Gctf 1.06
CTF CORRECTION RELION 2.1.b1
MODEL FITTING PHENIX 1.13-2998
MODEL REFINEMENT PHENIX 1.13-2998
INITIAL EULER ASSIGNMENT cryoSPARC 0.6.1
FINAL EULER ASSIGNMENT RELION 2.1b1
CLASSIFICATION RELION 2.1b1
RECONSTRUCTION RELION 2.1b1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?
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