7QV6

ELECTRON MICROSCOPY

Sample

aurein 3.3

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE-PROPANE
Sample Vitrification Details wait time 15s after application, blot time 4s
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 35289
Reported Resolution (Å) 3.5
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target CC
Overall B Value 78.37
Fitting Procedure ?
Details - Initial model building of a single helical layer using ChimeraX and Coot - Expansion to three layers, refinement in ISOLDE - Truncation of outer layers, re-expansion to three layers, refinement using phenix.real_space_refine
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 40
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 500
Maximum Defocus (nm) 2500
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 ?
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION EPU 2.8.0.1256
IMAGE ACQUISITION DigitalMicrograph 3.32.2403
CTF CORRECTION RELION 3.1.3
MODEL FITTING UCSF ChimeraX 1.3
MODEL FITTING Coot 0.9.3
INITIAL EULER ASSIGNMENT cryoSPARC 2.3
INITIAL EULER ASSIGNMENT RELION 3.1.3
FINAL EULER ASSIGNMENT RELION 3.1.3
CLASSIFICATION RELION 3.1.3
RECONSTRUCTION RELION 3.1.3
MODEL REFINEMENT PHENIX 1.19.1
MODEL REFINEMENT ISOLDE 1.0
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION CTF refined after 3D reconstruction