ELECTRON MICROSCOPY

Sample

Replication initiation intermediate with Escherichia coli DnaB helicase and Phage Lambda loader P in a 6:6 stoichiometry ratio

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Protein BP (1.5 uM), ssDNA (1.875 uM), and LO-156-299-NHis (2.25 uM) was mixed at 1.25 and 1.5 molar excess, respectively. 3uL of the sample was added to a plasma-cleaned grid at 4 degrees celsius, 100 percent humidity, blot force 4, blot time 4s, wait time 30s, total blots 1, and plunge-frozen into liquid nitrogen-cooled ethane.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 572557
Reported Resolution (Å) 3.85
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 153.98
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 51.19
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 600
Maximum Defocus (nm) 2700
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 81000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 4
IMAGE ACQUISITION Leginon ?
CTF CORRECTION cryoSPARC 4
MODEL FITTING PHENIX 1.21.2_5419
RECONSTRUCTION cryoSPARC 4
MODEL REFINEMENT PHENIX 1.21.2_5419
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?