Experiment: 1F6X

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2 mM P4 RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 90% H2O, 10% D2O	90% H2O/10% D2O	100 mM Na	6.5	ambient	288
2	2D NOESY	2 mM P4 RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 99.96% D2O	99.96% D2O	100 mM Na	6.5	ambient	288
3	2D NOESY	2 mM P4 RNA; 100 mM sodium chloride; 10 mM magnesium chloride; 10 mM phosphate buffer; 90% H2O, 10% D2O	90% H2O/10% D2O	100 mM Na, 10 mM Mg	6.5	ambient	288
4	2D NOESY	2 mM P4 RNA; 100 mM sodium chloride; 3 mM hexammine cobalt chloride; 10 mM phosphate buffer; 90% H2O, 10% D2O	90% H2O/10% D2O	100 mM Na, 3 mM Co(NH3)6	6.5	ambient	288
5	DQF-COSY	2 mM P4 RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 99.96% D2O	99.96% D2O	100 mM Na	6.5	ambient	288
6	31P-1H-COSY	2 mM P4 RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 99.96% D2O	99.96% D2O	100 mM Na	6.5	ambient	288
7	13C-1H-HMQC	2 mM P4 RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 99.96% D2O	99.96% D2O	100 mM Na	6.5	ambient	288

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	600
2	Bruker	DRX	500

NMR Refinement
Method	Details	Software
restrained molecular dynamics; simulated annealing	The average structure is based on superposition of nine converged structures after refinement. The average RMS deviation between the ensemble and the average structure is 1.8 Angstrom. A total of 266 NOE-derived distance constraints, 164 dihedral restraints and 48 distance restraints from hydrogen bonds were used in the refinement	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria
Conformers Calculated Total Number
Conformers Submitted Total Number	1
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques and 13C and 31P heteronuclear techniques at natural abundance

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	3.1	Bruker
2	processing	Felix	95.0	MSI
3	structure solution	X-PLOR	3.841	Brunger
4	refinement	X-PLOR	3.841	Brunger

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.