2O32

Solution structure of U2 snRNA stem I from human, containing modified nucleotides

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	0.5 mM RNA; 50 mM NaCl; 90% H2O, 10% D2O	90% H2O/10% D2O	50 mM NaCl	7.0	ambient	283
2	2D NOESY	0.5 mM RNA; 50 mM NaCl; 99.99% D2O	99.99% D2O	50 mM NaCl	7.0	ambient	303
3	2D TOCSY	0.5 mM RNA; 50 mM NaCl; 99.99% D2O	99.99% D2O	50 mM NaCl	7.0	ambient	303
4	2D 13C-1H HSQC	0.5 mM RNA; 50 mM NaCl; 99.99% D2O	99.99% D2O	50 mM NaCl	7.0	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	750

NMR Refinement
Method	Details	Software
simulated annealing molecular dynamics torsion angle dynamics		CNS

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

Additional NMR Experimental Information
Details	This structure was determined using standard 2D NOESY, 2D TOCSY, and natural 13C abundance 2D HSQC.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CNS	1.1	Brunger, Adams, Clore, Delano, Gros, Grossekunstleve, Jiang, Kuszewski, Nilges, Pannu, Read, Rice, Simonson, Warren
2	refinement	X-PLOR	2.11.0	Schwieters, Kuszewski, Tjzndra, Clore