2MWZ

Xanthine and 8-oxoguanine in G-quadruplexes: formation of a G G X O tetrad

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H NOESY	0.7 mM DNA, 20 mM potassium phosphate, 70 mM potassium chloride	90% H2O/10% D2O	90	8.0	ambient	298
2	2D 1H-1H COSY	0.7 mM DNA, 20 mM potassium phosphate, 70 mM potassium chloride	90% H2O/10% D2O	90	8.0	ambient	298
3	2D 1H-1H TOCSY	0.7 mM DNA, 20 mM potassium phosphate, 70 mM potassium chloride	90% H2O/10% D2O	90	8.0	ambient	298
4	2D 1H-13C HSQC aromatic	0.7 mM DNA, 20 mM potassium phosphate, 70 mM potassium chloride	90% H2O/10% D2O	90	8.0	ambient	298
5	2D 1H-13C HSQC aliphatic	0.7 mM DNA, 20 mM potassium phosphate, 70 mM potassium chloride	90% H2O/10% D2O	90	8.0	ambient	298
6	2D 1H-15N HSQC	0.7 mM DNA, 20 mM potassium phosphate, 70 mM potassium chloride	90% H2O/10% D2O	90	8.0	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Bruker	AVANCE	700

NMR Refinement
Method	Details	Software
DGSA-distance geometry simulated annealing, simulated annealing, molecular dynamics		X-PLOR NIH

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore
2	structure solution	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore
3	refinement	Amber		Case, Darden, Cheatham, III, Simmerling, Wang, Duke, Luo, and Kollman
4	chemical shift assignment	Sparky		Goddard
5	peak picking	Sparky		Goddard
6	data analysis	Sparky		Goddard
7	collection	TopSpin		Bruker Biospin