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Structure of a spliceosome remodeled for exon ligation
Sample Saccharomyces cerevisiae spliceosome. Complex C just after Prp16-mediated remodeling
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK III Cryogen Name ETHANE Sample Vitrification Details 3.5 microlitres sample were applied to the grid, left for 25 seconds and then blotted for 3.0-3.5 seconds before plunging.
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 29527 Reported Resolution (Å) 4.17 Resolution Method FSC 0.143 CUT-OFF Other Details A 3D reconstruction was obtained after refinement of a subset of particles obtained by classification with a mask around Prp22. Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 Refinement Space RECIPROCAL Refinement Protocol FLEXIBLE FIT Refinement Target Fourier Shell Correlation Overall B Value 330 Fitting Procedure Details Used secondary structure restraints generated in ProSMART and LibG.
Data Acquisition Detector Type GATAN K2 SUMMIT (4k x 4k) Electron Dose (electrons/Å**2) 2
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 500 Maximum Defocus (nm) 4500 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 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 GIF Quantum energy filter, 20 eV slit width
EM Software Task Software Package Version PARTICLE SELECTION RELION 1.4 CTF CORRECTION CTFFIND 4 MODEL FITTING Coot 0.8.3 MODEL REFINEMENT REFMAC 5.8 INITIAL EULER ASSIGNMENT RELION 1.4 FINAL EULER ASSIGNMENT RELION 1.4 CLASSIFICATION RELION 1.4 RECONSTRUCTION RELION 1.4
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 350000 Selected initial particles automatically using C complex 2D class averages, low-pass filtered to 20 Angstrom for automatic particle picking.