ELECTRON MICROSCOPY

Sample

SOS Signal Complex consisting of RecA, ssDNA, and LexA

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Blotting time of 7.0 s; 0.0 blot force
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 233920
Reported Resolution (Å) 2.93
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 46.2
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 500
Maximum Defocus (nm) 2000
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 64000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Preliminary grid screening was done manually
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 4.0.3
IMAGE ACQUISITION EPU ?
CTF CORRECTION cryoSPARC 4.0.3
MODEL FITTING UCSF ChimeraX 1.3
MODEL REFINEMENT PHENIX 1.20.1
MODEL REFINEMENT ISOLDE 1.4
CLASSIFICATION cryoSPARC 4.0.3
RECONSTRUCTION cryoSPARC 4.0.3
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?