ELECTRON MICROSCOPY

Sample

Helical filament of HRAD51 on single-stranded DNA with AMPPNP

Specimen Preperation
Sample Aggregation State HELICAL ARRAY
Vitrification Instrument ?
Cryogen Name NITROGEN
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 60000
Reported Resolution (Å) 4.2
Resolution Method FSC 0.143 CUT-OFF
Other Details Helical segments were divided in half, not drawn randomly or odd/even as this would result in some segments from the same filament in both half models. Thus, it is strictly not gold-standard.
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space RECIPROCAL
Refinement Protocol FLEXIBLE FIT
Refinement Target Maximum likelihood
Overall B Value 94.574
Fitting Procedure ?
Details Backbone fitting is good but many of the sidechains cannot be relied on as the map resolution was insufficient.
Data Acquisition
Detector Type FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å2) 20
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 2000
Maximum Defocus (nm) ?
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 59000
Calibrated Magnification 104477
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION Ximdisp ?
IMAGE ACQUISITION EPU ?
CTF CORRECTION Gctf ?
MODEL FITTING Coot ?
CLASSIFICATION RELION 1.4
RECONSTRUCTION RELION 1.4
MODEL REFINEMENT REFMAC ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
NONE per segment
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