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Cas1-Cas2-Csn2-DNA complex from the Type II-A CRISPR-Cas system
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 3V7F experimental model PDB 5XVN
Sample Cas1-Cas2-Csn2-DNA monomer complex Sample Components 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 306470 Reported Resolution (Å) 3.6 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (3V7F, 5XVN, 5XVN, 5XVN) Refinement Space REAL Refinement Protocol OTHER Refinement Target Correlation coefficient and visual inspection Overall B Value Fitting Procedure Details Rounds of manual fitting in Coot, jelly-body refinement in REFMAC and real-space refinement in PHENIX
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 INITIAL EULER ASSIGNMENT RELION 3.0 FINAL EULER ASSIGNMENT RELION 3.0 CLASSIFICATION RELION 3.0 RECONSTRUCTION RELION 3.0 MODEL REFINEMENT Coot MODEL REFINEMENT REFMAC MODEL REFINEMENT PHENIX
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 853391 Reproductions of an initial ab initio generated 3D reconstruction were used as templates for auto picking