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Segment of the Cas1-Cas2-Csn2-DNA filament complex from the Type II-A CRISPR-Cas system
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 6QXF experimental model PDB 6XQF
Sample Cas1-Cas2-Csn2-DNA monomer complex Sample Components Minimal unit of the Cas1-Cas2-Csn2 DNA
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details 15 s wait time, 1 s blot time.
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 66576 Reported Resolution (Å) 9.1 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (6QXF, 6QXF, 6XQF, 6XQF, 6XQF) Refinement Space REAL Refinement Protocol FLEXIBLE FIT Refinement Target Correlation coefficient and visual inspection Overall B Value Fitting Procedure Details Rigid-body refinement in PHENIX of the higher resolution models, only the idealised linear DNA was subjected to jelly-body refinement in Refmac
Data Acquisition Detector Type FEI FALCON III (4k x 4k) Electron Dose (electrons/Å**2) 92.8
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 1300 Maximum Defocus (nm) 2800 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 75000 Calibrated Magnification 129032 Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version IMAGE ACQUISITION EPU CTF CORRECTION Gctf MODEL FITTING UCSF Chimera MODEL FITTING Coot MODEL REFINEMENT Coot MODEL REFINEMENT REFMAC MODEL REFINEMENT PHENIX INITIAL EULER ASSIGNMENT RELION 3.0 FINAL EULER ASSIGNMENT RELION 3.0 CLASSIFICATION RELION 3.0 RECONSTRUCTION RELION 3.0
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 349809 Reproductions of an initial ab initio generated 3D reconstruction were used as templates for auto picking.