8C7B

Slow cation movements within tetramolecular G-quadruplex: vacant cation binding sites in addition to all syn G-quartet

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	2 mM [U-99% 13C; U-99% 15N] DNA (5'-D(*GP*GP*GP*GP*CP*C)-3')	90% H2O/10% D2O	100 mM	6	1 atm	298	Varian Uniform NMR System 600
2	1D 1H-15N HSQC	2 mM [U-99% 13C; U-99% 15N] DNA (5'-D(*GP*GP*GP*GP*CP*C)-3')	90% H2O/10% D2O	100 mM	6	1 atm	298	Varian Uniform NMR System 600
3	2D 1H-13C HSQC	2 mM [U-99% 13C; U-99% 15N] DNA (5'-D(*GP*GP*GP*GP*CP*C)-3')	90% H2O/10% D2O	100 mM	6	1 atm	298	Varian Uniform NMR System 600
4	2D NOESY	2 mM [U-99% 13C; U-99% 15N] DNA (5'-D(*GP*GP*GP*GP*CP*C)-3')	90% H2O/10% D2O	100 mM	6	1 atm	298	Varian Uniform NMR System 800
5	2D NOESY	2 mM [U-99% 13C; U-99% 15N] DNA (5'-D(*GP*GP*GP*GP*CP*C)-3')	100% D2O	100 mM	6	1 atm	298	Varian Uniform NMR System 800

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	Uniform NMR System	600
2	Varian	Uniform NMR System	800

NMR Refinement
Method	Details	Software
simulated annealing		Amber

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	100
Conformers Submitted Total Number	13
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR		Varian
2	chemical shift assignment	Sparky		Goddard
3	peak picking	Sparky		Goddard
4	refinement	Amber		Case, Darden, Cheatham III, Simmerling, Wang, Duke, Luo, and Kollman
5	structure calculation	Amber		Case, Darden, Cheatham III, Simmerling, Wang, Duke, Luo, and Kollman