1K4B

STRUCTURE OF AGUU RNA TETRALOOP, NMR, 20 STRUCTURES

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2.0 mM RNA hairpin, pH6.3, 10 mM NaCl, 90% H2O, 10% D2O	90% H2O/10% D2O	10mM	6.3	1 atm	274
2	2D NOESY	2.0 mM RNA hairpin, pH6.3, 10 mM NaCl	99.99% D2o	10mM	6.3	1 atm	293
3	3D_13C-separated_NOESY	1.0 mM 13C/15N labeled RNA hairpin, pH6.3, 10 mM NaCl	99.99% D2o	10mM	6.3	1 atm	293

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

NMR Refinement
Method	Details	Software
distance geometry simulated annealing	The structures are based on a total of 341 restraints, 261 are NOE-derived distance constraints, 54 dihedral angle restraints. Additional 26 distance restraints from hydrogen bond are used in the stem region.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (this is the lowest energy structure.)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.6	Bruker
2	data analysis	Felix	2000	MSI
3	refinement	X-PLOR	3.1	Brunger

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.