6T7B

Structure of human Sox2 transcription factor in complex with a nucleosome

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	6FQ5

Sample
Structure of human Sox2 transcription factor in complex with a nucleosome
Sample Components
Histone H2A type 1, H2B type 1-K, H3.2, H4 and SOX2
DNA

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	The sample was applied onto glow-discharged Quantifoil holey carbon grids. The grids were blotted from both sides for 5-10 seconds at 16*C in a chambe ...	The sample was applied onto glow-discharged Quantifoil holey carbon grids. The grids were blotted from both sides for 5-10 seconds at 16*C in a chamber at 100% humidity and plunge-frozen into liquid ethane using a manual plunger.

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	32301
Reported Resolution (Å)	5.1
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (6FQ5)
Refinement Space	REAL
Refinement Protocol	OTHER
Refinement Target
Overall B Value	100
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	1.125

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1000
Maximum Defocus (nm)	3500
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	130000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	At least 50% of the data were collected at 25* stage tilt in order to partially compensate for preferred orientation of particles on the grid, and to improve angular distribution.

EM Software
Task	Software Package	Version
PARTICLE SELECTION	Gautomatch
IMAGE ACQUISITION	EPU
CTF CORRECTION	Gctf
MODEL REFINEMENT	PHENIX
INITIAL EULER ASSIGNMENT	RELION
FINAL EULER ASSIGNMENT	RELION
CLASSIFICATION	RELION
RECONSTRUCTION	RELION

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

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 R01GM157729.