ELECTRON MICROSCOPY

Sample

Structure of trimeric SlpA protein

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Vitrobot options: Blot time 4.5 seconds, Blot force -10,1, Wait time 10 seconds, Drain time 0.5 seconds
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 122412
Reported Resolution (Å) 3.25
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol AB INITIO MODEL
Refinement Target Best Fit
Overall B Value 51.67
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 47.909
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 4000
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 81000
Calibrated Magnification 81000
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details EPU software with faster acquisition mode AFIS (Aberration Free Image Shift).
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION Topaz 0.2.5
IMAGE ACQUISITION EPU ?
CTF CORRECTION CTFFIND 4.1.13
MODEL FITTING Coot 0.9.2-pre
MODEL REFINEMENT PHENIX 1.19-4092
INITIAL EULER ASSIGNMENT RELION 3.1
FINAL EULER ASSIGNMENT RELION 3.1
CLASSIFICATION RELION 3.1
RECONSTRUCTION RELION 3.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION RELION refinement with in-built CTF correction. The function is similar to a Wiener filter, so amplitude correction included.