2KKA

Human telomere DNA two-tetrad quadruplex structure in K+ solution

SOLUTION NMR

---

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H NOESY	1 mM DNA (5'-D(*AP*GP*GP*GP*TP*TP*AP*GP*GP*GP*TP*TP*AP*(DI)P*GP*GP*TP*TP*AP*GP*GP*GP*T)-3')-1, 60 mM potassium chloride-2, 30 mM potassium phosphate-3	90% H2O/10% D2O	90	7	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	600

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

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	100
Conformers Submitted Total Number	8
Representative Model	1 (fewest violations)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore