2IRO

The NMR Structures of (rGCUGAGGCU)2 and (rGCGGAUGCU)2

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1 mM Duplex, 80 mM NaCl, 0.5 mM Na2EDTA, 10 mM sodium phosphate, pH 5.5, 90%H2O, 10%D2O	90% H2O/10% D2O		5.18		278
2	DQF-COSY	1 mM Duplex, 80 mM NaCl, 0.5 mM Na2EDTA, 10 mM sodium phosphate, pH 5.5, 90%H2O, 10%D2O	90% H2O/10% D2O		5.18		278

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	600

NMR Refinement
Method	Details	Software
simulated annealing and restrained molecular dynamics	structures validated by chemical back calculation using the program Nuchemics	CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	30
Conformers Submitted Total Number	15
Representative Model	1 (fewest violations,lowest energy)

Additional NMR Experimental Information
Details	natural abundance 13C-1H and 15N-1H HSQC

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CNS	1.1	Brunger et al.
2	processing	NMRPipe		Delaglio et al.
3	data analysis	Sparky	3	Goddard et al.
4	refinement	CNS	1.1	Brunger et al.