ELECTRON MICROSCOPY

Sample

Deacetylated Microtubule

Specimen Preperation
Sample Aggregation State HELICAL ARRAY
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Blotted for 4 seconds at blot force 10.
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 24692
Reported Resolution (Å) 4
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 BACKBONE TRACE
Refinement Target 0.5
Overall B Value 126
Fitting Procedure ?
Details We use PHENIX to perform real space refinement and sharpen our cryoEM maps.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 25
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1500
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 22500
Calibrated Magnification 23364
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Preliminary grid screening was performed manually and all of the alignments were initially done using a gold calibration grid.
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION Appion 2.0
IMAGE ACQUISITION SerialEM 3.7
CTF CORRECTION CTFFIND 4
MODEL FITTING PHENIX 1.14
MODEL REFINEMENT PHENIX 1.14
INITIAL EULER ASSIGNMENT EMAN 1.9
FINAL EULER ASSIGNMENT EMAN 1.9
CLASSIFICATION EMAN 1.9
RECONSTRUCTION FREALIGN 9.11
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION CTFFIND4