2GD7

The Structure of the Cyclin T-binding domain of Hexim1 reveals the molecular basis for regulation of transcription elongation

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_13C-separated_NOESY	0.6 mM U-15N,13C, 20 mM potassium phosphate buffer, pH 7.2, 50 mM NaCl, 10mM TCEP/HCl, 1 mM DTE, 0.02% Na-azide	100% D2O	50 mM NaCl, 20 mM KPi	7.2	ambient	308
2	3D_15N-separated_NOESY	1.2 mM U-15N, 20 mM potassium phosphate buffer, pH 7.2, 50 mM NaCl, 10mM TCEP/HCl, 1 mM DTE, 0.02% Na-azide, 95% H2O, 5% D2O	95% H2O/5% D2O	50 mM NaCl, 20 mM KPi	7.2	ambient	308
3	3D 13C-filter-edit-NOESY	0.5 mM U-15N,13C, 0.5 mM unlabeled, 20 mM potassium phosphate buffer, pH 7.2, 50 mM NaCl, 10mM TCEP/HCl, 1 mM DTE, 0.02% Na-azide, 95% H2O, 5% D2O	95% H2O/5% D2O	50 mM NaCl, 20 mM KPi	7.2	ambient	308
4	3D HNHA, 3D HNHB	1.2 mM U-15N, 20 mM potassium phosphate buffer, pH 7.2, 50 mM NaCl, 10mM TCEP/HCl, 1 mM DTE, 0.02% Na-azide, 95% H2O, 5% D2O	95% H2O/5% D2O	50 mM NaCl, 20 mM KPi	7.2	ambient	308
5	3D HACAHB-COSY	0.6 mM U-15N,13C, 20 mM potassium phosphate buffer, pH 7.2, 50 mM NaCl, 10mM TCEP/HCl, 1 mM DTE, 0.02% Na-azide	100% D2O	50 mM NaCl, 20 mM KPi	7.2	ambient	308
6	2D 15N-IPAP-HSQC, 3D HNCACO	0.6 mM U-15N,13C, 20 mM potassium phosphate buffer, pH 7.2, 50 mM NaCl, 10mM TCEP/HCl, 1 mM DTE, 0.02% Na-azide	95% H2O, 5% D2O, 16 mg/ml PF1 phage	50 mM NaCl, 20 mM KPi	7.2	ambient	308

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	800
2	Bruker	DRX	600

NMR Refinement
Method	Details	Software
torsion angle dynamics and cartesian coordinate simulated annealing	The structures are based on a total of 2592 NOE distance restraints, 163 dihedral angle restraints, 102 hydrogen bonds distance restraints, and 80 RDC restraints per monomer.	NMRPipe

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	200
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	The structure was determined using triple-resonance NMR spectroscopy in solution.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	NMRPipe		F.Delaglio
2	data analysis	NMRView	5.0.4	B.A.Johnson
3	structure solution	X-PLOR-NIH	2.9.9	A.T.Bruenger, C.D.Schwieters
4	refinement	X-PLOR-NIH	2.9.9	A.T.Bruenger, C.D.Schwieters

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.