ELECTRON MICROSCOPY

Sample

RecT protein from Listeria innocua phage A118, complexed with two complementary strands of ssDNA that were added to the protein sequentially

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details 1.5 second blot time. Ted Pella 595 filter paper.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 390000
Reported Resolution (Å) 3.4
Resolution Method FSC 0.143 CUT-OFF
Other Details Tight Mask FSC resolution was 3.4; No mask FSC resolution was 4.3
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol AB INITIO MODEL
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details Phenix Real Space Refinement included secondary restraints and 10-fold NCS constraints.
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 66
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 3500
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 81000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION EPU ?
CTF CORRECTION cryoSPARC 2.15.0
MODEL FITTING Coot 0.8.7
RECONSTRUCTION cryoSPARC 2.15.0
MODEL REFINEMENT PHENIX 1.20.1-4487
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION Patch CTD estimation was implemented in cryoSPARC with am amplitude contrast of 0.1
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