9B9V

Cryo-EM structure of the ZBTB9 BTB domain filament

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
in silico model	AlphaFold

Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	10.9598
f_angle_d	0.6504
f_chiral_restr	0.0391
f_plane_restr	0.005
f_bond_d	0.0029

Sample
ZBTB9 BTB domain filament

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	LEICA EM GP
Cryogen Name	ETHANE
Sample Vitrification Details	Grids were vitrified using a Leica EM GP plunge freezer operated at 90% humidity and 10 C with 10 s pre-blot, 3 s blot, 3 s post-blot.

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles	147135
Reported Resolution (Å)	8.1
Resolution Method	FSC 0.143 CUT-OFF
Other Details	Asymmetric helical refinement followed by local refinement led to the final reconstruction. The helical symmetry values represent the angular rotation ...	Asymmetric helical refinement followed by local refinement led to the final reconstruction. The helical symmetry values represent the angular rotation and axial rise for two dimers at the core of the map, where the local resolution was the highest. These values, however, were not applied during helical refinement as they did not improve the quality of the final reconstruction.
Refinement Type
Symmetry Type	HELICAL
Axial Symmetry	C1
Axial Rise	36.1
Angular Rotation	101.9

Map-Model Fitting and Refinement
Id	1
Refinement Space	REAL
Refinement Protocol	OTHER
Refinement Target
Overall B Value	762
Fitting Procedure
Details	Real-space refinement without local grid search

Data Acquisition
Detector Type	GATAN K3 (6k x 4k)
Electron Dose (electrons/Å**2)	50.1

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TALOS ARCTICA
Minimum Defocus (nm)	800
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	36000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21.1_5286

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		2022676

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.