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Cryo-EM structure of an MCM helicase single hexamer loaded onto dsDNA.
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 7P30
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 13.5 f_angle_d 0.622 f_chiral_restr 0.044 f_bond_d 0.005 f_plane_restr 0.005
Sample Hexameric MCM helicase complex loaded onto duplex DNA
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 396366 Reported Resolution (Å) 3.41 Resolution Method FSC 0.143 CUT-OFF Other Details Reported resolution obtained from maps after Relion 3D Refinement Refinement Type Symmetry Type POINT
Map-Model Fitting and Refinement Id 1 (7P30) Refinement Space Refinement Protocol Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type GATAN K2 SUMMIT (4k x 4k) Electron Dose (electrons/Å**2) 51.2
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 1500 Maximum Defocus (nm) 4500 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 2.7 Imaging Mode BRIGHT FIELD Specimen Holder Model Nominal Magnification 130000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION Topaz IMAGE ACQUISITION EPU MODEL FITTING Coot 0.9.5 CLASSIFICATION RELION 3.1 RECONSTRUCTION RELION 3.1 MODEL REFINEMENT PHENIX 1.19.2_4158:
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 621909