Experiment: 1T4X

The first left-handed RNA structure of (CGCGCG)2, Z-RNA, NMR, 12 structures, determined in high salt

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	RNA (2-3 mM) in buffer containing 150 mM NaCl, 10 mM sodium phosphate pH 6.5, 0.1 mM EDTA and 6M NaClO4	D2O (99.98%)	6M NaClO4	6.5	ambient	303
2	DQF-COSY	RNA (2-3 mM) in buffer containing 150 mM NaCl, 10 mM sodium phosphate pH 6.5, 0.1 mM EDTA and 6M NaClO4	D2O (99.98%)	6M NaClO4	6.5	ambient	303
3	31P-1H HETCOR	RNA (2-3 mM) in buffer containing 150 mM NaCl, 10 mM sodium phosphate pH 6.5, 0.1 mM EDTA and 6M NaClO4	D2O (99.98%)	6M NaClO4	6.5	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITYPLUS	500

NMR Refinement
Method	Details	Software
molecular dynamics with NMR restraints	NMR refinement using X-PLOR, NOE intra-residue distances 120, NOE inter-residue distances 112, Dihedral angle restraints 100, Watson-Crick pair distances 18, Planarity of base pairs - 6. Total restraints/residue: 30	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	12
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1B	Varian
2	data analysis	Felix	2000	Accelrys
3	structure solution	CYANA	1.0	Guentert
4	refinement	X-PLOR	3.851	Brunger