ELECTRON MICROSCOPY

Sample

Spliceosomal P complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument ?
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 212219
Reported Resolution (Å) 3.3
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol ?
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details The author states the following for the pre-mRNA model building: For regions in the intron or exon where no clear sequence preferences were observed (Spingola et al., PMID 10024174), U, A, U, and A-U are used to represent a generic nucleotide, purine, pyrimidine, and standard Watson-Crick basepair, respectively, based on the EM density. Nucleotides -7 to +7 in the exon are modeled mostly as the preferred nucleotides in each position (Spingola et al. PMID 10024174) unless the density suggests otherwise. Some nucleotides in the intron seem to form basepairs with defined U2 or U6 snRNA sequence based on EM densities, and are modeled as complementary nucleotides to the corresponding U2 or U6 sequence unless the density suggests otherwise.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 2.0
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 ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification ?
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION Leginon 2.0
CTF CORRECTION CTFFIND 4
INITIAL EULER ASSIGNMENT RELION 2.1
FINAL EULER ASSIGNMENT RELION 2.1
CLASSIFICATION RELION 2.1
RECONSTRUCTION RELION 2.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?