ELECTRON MICROSCOPY

Sample

Dicing state of mouse somatic dicer with pre-mir-15a

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Described in STAR methods
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 64038
Reported Resolution (Å) 5.91
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 FLEXIBLE FIT
Refinement Target Ramachandran Plot, Rotamer Analysis, Density Fit Analysis, Correlation coefficient
Overall B Value 520
Fitting Procedure ?
Details We used our previous deposition 7YYN as an initial model source. Initial local fitting was done using Chimera. ISOLDE was used for flexible fitting with torsion restraints defined for polypeptide chain and distance restraints for polyribonucleotides.
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 60.198
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 800
Maximum Defocus (nm) 3500
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
PARTICLE SELECTION Topaz ?
CTF CORRECTION cryoSPARC v3.3.1
MODEL FITTING UCSF Chimera 1.15
MODEL REFINEMENT ISOLDE 1.1.0
CLASSIFICATION cryoSPARC v3.3.1
RECONSTRUCTION cryoSPARC v3.3.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?