5OIK

Structure of an RNA polymerase II-DSIF transcription elongation complex

ELECTRON MICROSCOPY

Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	10.916
f_angle_d	1.059
f_chiral_restr	0.061
f_bond_d	0.011
f_plane_restr	0.006

Sample
RNA polymerase II-DSIF elongation complex
Sample Components
RNA polymerase II
DSIF
DNA-RNA synthetic construct

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	Sample (four microliters) was applied to glow-discharged Quantifoil R 2/1 holey carbon grids, which were then blotted for 8.5s and plunge-frozen in li ...	Sample (four microliters) was applied to glow-discharged Quantifoil R 2/1 holey carbon grids, which were then blotted for 8.5s and plunge-frozen in liquid ethane.

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	101140
Reported Resolution (Å)	3.7
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1
Refinement Space	REAL
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	33

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	600
Maximum Defocus (nm)	3600
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	37000
Calibrated Magnification	37037
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	RELION	1.4
IMAGE ACQUISITION	TOM Toolbox
CTF CORRECTION	CTFFIND	4.0.16
MODEL FITTING	Rosetta	3.6
INITIAL EULER ASSIGNMENT	RELION	1.4
FINAL EULER ASSIGNMENT	RELION	1.4
RECONSTRUCTION	RELION	1.4
MODEL REFINEMENT	PHENIX	1.10

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		687928

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.