ELECTRON MICROSCOPY

Sample

MCM hexamer bound to Mg/ADP-BeFx and 16-mer oligo-dT. Class 2

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument ?
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 776823
Reported Resolution (Å) 2.76
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 OTHER
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details Bond distance and angle restraints for a tetrahedral Zn2+ coordination were applied. Bond distance and angle restraints for a octahedral Mg2+ coordination were applied.
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 78
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 800
Maximum Defocus (nm) 1800
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
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 cryoSPARC 2.14.2
IMAGE ACQUISITION SerialEM ?
CTF CORRECTION cryoSPARC 3.31
MODEL FITTING PHENIX 1.20.1_4487
MODEL REFINEMENT PHENIX 1.20.1_4487
INITIAL EULER ASSIGNMENT cryoSPARC 2.14.2
FINAL EULER ASSIGNMENT cryoSPARC 3.3.1
CLASSIFICATION cryoSPARC 3.3.1
RECONSTRUCTION cryoSPARC 3.3.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION Initial CTF was calculated by cryoSPARC Patch CTF. CTF parameters were refined during final homogeneous refinement in cryoSPARC.