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CryoEM structure of locally-refined tetramer of Shedu nuclease domain from Bacillus cereus
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 8.173 f_angle_d 0.318 f_chiral_restr 0.038 f_bond_d 0.002 f_plane_restr 0.002
Sample Shedu nuclease domain in an active form, which lacks N-terminal domains. A tetramer copy of the overall octamer assembly complex.
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 331076 Reported Resolution (Å) 2.77 Resolution Method FSC 0.143 CUT-OFF Other Details Local refinement using cryoSPARC, with NU refinement option enabled. Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 Refinement Space Refinement Protocol Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type FEI FALCON IV (4k x 4k) Electron Dose (electrons/Å**2) 55
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 800 Maximum Defocus (nm) 2200 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
EM Software Task Software Package Version MODEL REFINEMENT PHENIX RECONSTRUCTION cryoSPARC 4.2.1
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION