1EVN

NMR OBSERVATION OF A-TETRAD

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2 mM potassium phosphate, 0.2 mM EDTA, 2-100 mM KCl	90% H2O/10% D2O		7.3	1 atm
2	2D NOESY	2 mM potassium phosphate, 0.2 mM EDTA, 2-100 mM KCl	D2O		7.3	1 atm
3	2D TOCSY	2 mM potassium phosphate, 0.2 mM EDTA, 2-100 mM KCl	D2O		7.3	1 atm
4	E-COSY	2 mM potassium phosphate, 0.2 mM EDTA, 2-100 mM KCl	D2O		7.3	1 atm

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

NMR Refinement
Method	Details	Software
Restrained energy minimization, simulated annealing-restrained molecular dynamics. Iterative relaxation matrix refinement		VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with acceptable covalent geometry
Conformers Calculated Total Number	8
Conformers Submitted Total Number	7
Representative Model	1 (closest to the average)

Additional NMR Experimental Information
Details	temperature, pH and salt dependent 1D spectra. Temperature varied from 0 to 70 C

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1	Varian
2	data analysis	Felix	230 and 97	BIOSYM
3	collection	XwinNMR	1.3	Bruker
4	structure solution	Discover	3.1	BIOSYM
5	refinement	IRMA	2.3	BIOSYM