ELECTRON MICROSCOPY

Sample

Pre-catalytic B complex Spliceosome

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK III
Cryogen Name ETHANE
Sample Vitrification Details Grids were glow-discharged for 15 s before deposition of 3 microliter sample (~1.5 mg mL-1), and subsequently incubated for 2-3.5 s before blotting and vitrification by plunging into liquid ethane with a Vitrobot Mark III (FEI) operated at 4 degrees Celsius and 100% humidity.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 9559
Reported Resolution (Å) 7.2
Resolution Method FSC 0.143 CUT-OFF
Other Details A temperature factor of -170 A2 was applied (sharpened B2 map).
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol ?
Refinement Target ?
Overall B Value 170
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 56
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) ?
Maximum Defocus (nm) ?
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 ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION RELION 2.0
IMAGE ACQUISITION DigitalMicrograph ?
CTF CORRECTION CTFFIND 4.1
CTF CORRECTION RELION 2.0
MODEL FITTING Coot 0.8.3
MODEL FITTING UCSF Chimera 1.10.2
MODEL FITTING Situs 2.8
MODEL REFINEMENT PHENIX 1.10.1-2155-000
INITIAL EULER ASSIGNMENT RELION 2.0
FINAL EULER ASSIGNMENT RELION 2.0
CLASSIFICATION RELION 2.0
RECONSTRUCTION RELION 2.0
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?