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Reconstruction was done using D1 symmetry because of an existing two-fold symmetry in the unit cells composing the helical lattice. This two-fold axis ...
Reconstruction was done using D1 symmetry because of an existing two-fold symmetry in the unit cells composing the helical lattice. This two-fold axis runs perpendicular to the helical axis. For the final structure, a filter was applied to the map in order to compensate for resolution-dependent amplitude falloff. To do so, we built a model by arranging UraA in a helical assembly in order to mimic the mass distribution in Bor1p tubes. Fourier transforms from this model and from the experimental maps were then rotationally averaged to produce 1D scattering profiles. The resolution-dependent amplitude ratio from these profiles was used as a filter that was applied to the experimental amplitudes using SPARX routines. Finally, a low-pass filter was applied with a 5 Angstrom stop-band frequency.
Refinement Type
Symmetry Type
HELICAL
Axial Symmetry
C1
Axial Rise
4.8
Angular Rotation
37.35
Map-Model Fitting and Refinement
Id
1 (4YZF, 4YZF)
Refinement Space
REAL
Refinement Protocol
FLEXIBLE FIT
Refinement Target
cross-correlation coefficient
Overall B Value
Fitting Procedure
Details
A homology model was first created using human AE1 (PDB entry 4YZF) as a template using MODELLER, placed into the density map using SITUS, and then fi ...
A homology model was first created using human AE1 (PDB entry 4YZF) as a template using MODELLER, placed into the density map using SITUS, and then fitted into the map using the Molecular Dynamics Flexible Fitting (MDFF) method.
Data Acquisition
Detector Type
GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)
45
Imaging Experiment
1
Date of Experiment
Temperature (Kelvin)
Microscope Model
FEI TECNAI F20
Minimum Defocus (nm)
1000
Maximum Defocus (nm)
2500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
2
Imaging Mode
BRIGHT FIELD
Specimen Holder Model
GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER