2KF7

Structure of a two-G-tetrad basket-type intramolecular G-quadruplex formed by human telomeric repeats in K+ solution (with G7-to-BRG substitution)

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-13C HSQC	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6	100% D2O		7		298
2	2D 1H-1H TOCSY	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6	100% D2O		7		298
3	2D 1H-1H COSY	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6	100% D2O		7		298
4	2D 1H-1H NOESY	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-1, 70mM potassium chloride-2, 20mM potassium phosphate-3	90% H2O/10% D2O		7		298
5	2D 1H-1H NOESY	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6	100% D2O		7		298
6	2D 1H-1H NOESY	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6	100% D2O		5		283
7	2D 1H-15N HSQC	0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-1, 70mM potassium chloride-2, 20mM potassium phosphate-3	90% H2O/10% D2O		7		298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	Avance	600
2	Bruker	Avance	700
3	Varian	INOVA	600

NMR Refinement
Method	Details	Software
matrix relaxation, molecular dynamics, DGSA-distance geometry simulated annealing		Felix

NMR Ensemble Information
Conformer Selection Criteria	back calculated data agree with experimental NOESY spectrum
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	peak picking	Felix	2007	Felix NMR, Inc.
2	processing	TOPSPIN		Bruker Biospin
3	structure solution	X-PLOR_NIH	2.21	Schwieters, Kuszewski, Tjandra, Clore
4	refinement	X-PLOR_NIH	2.21	Schwieters, Kuszewski, Tjandra, Clore