ELECTRON MICROSCOPY

Sample

The U2 5' module of the A3'-SSA complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details The A3'-SSA complex was frozen in vitreous ice by applying ~2.2 uL crosslinked sample to both sides of a glow-discharged UltrAufoil R1.2/1.3 gold grid. The excess sample was blotted away for 2s using a blot force of 7 and the grid was snap frozen in liquid ethane cooled by liquid nitrogen.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 78262
Reported Resolution (Å) 3.1
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 OTHER
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 41.41
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1000
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 81000
Calibrated Magnification 81000
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION Warp ?
IMAGE ACQUISITION SerialEM ?
CTF CORRECTION Warp ?
MODEL FITTING Coot 0.9.2
MODEL FITTING UCSF Chimera ?
MODEL REFINEMENT PHENIX 1.19-4092
INITIAL EULER ASSIGNMENT RELION 3.0.8
FINAL EULER ASSIGNMENT RELION 3.1 beta
CLASSIFICATION RELION 3.1 beta
RECONSTRUCTION RELION 3.1 beta
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?