ELECTRON MICROSCOPY


Sample

Escherichia coli KTE40 DyP peroxidase-loaded encapsulin shell

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Grids were frozen with a blot force of 20, blot time of 4 seconds, 100% humidity, and chamber temperature of 22 degrees C.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 286236
Reported Resolution (Å) 2.17
Resolution Method FSC 0.143 CUT-OFF
Other Details Homogeneous refinement was used against an ab-initio map with I symmetry, per-particle defocus optimization enabled, per-group CTF parameter optimization enabled, and Ewald sphere correction enabled using a positive curvature sign.
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 85.5
Fitting Procedure ?
Details The AlphaFold model was placed using ChimeraX, followed by iterative manual refinement in Coot followed by Phenix real space refinements.
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 39.91
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 800
Maximum Defocus (nm) 2500
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 105000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC v.4.1.2
IMAGE ACQUISITION SerialEM ?
CTF CORRECTION cryoSPARC V.4.1.2
MODEL FITTING UCSF ChimeraX 1.8
INITIAL EULER ASSIGNMENT cryoSPARC v.4.1.2
FINAL EULER ASSIGNMENT cryoSPARC v.4.1.2
RECONSTRUCTION cryoSPARC v.4.1.2
MODEL REFINEMENT Coot 0.9.8
MODEL REFINEMENT PHENIX 1.2.1-4487
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?