Experiment: 1Y8D

Dimeric parallel-stranded tetraplex with 3+1 5' G-tetrad interface, single-residue chain reversal loops and GAG triad in the context of A(GGGG) pentad

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	DNA 15N,13C	90 MM KCL pH 7; 90%H2O,10% D2O	90 mM KCl	7	1 atm	298
2	2D NOESY	DNA 15N,13C	90 MM KCL pH 7; 100% D2O
3	2D TOCSY	DNA 15N,13C	90 MM KCL pH 7; 90%H2O,10% D2O	90 mM KCl	7	1 atm	298
4	1H-31P COSY	DNA 15N,13C	90 MM KCL pH 7; 100% D2O
5	1H-15N JRHMQC	DNA 15N,13C	90 MM KCL pH 7; 90%H2O,10% D2O	90 mM KCl	7	1 atm	298
6	1H-13C JRHMBC	DNA 15N,13C	90 MM KCL pH 7; 90%H2O,10% D2O	90 mM KCl	7	1 atm	298

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

NMR Refinement
Method	Details	Software
distance geometry; simulated annealing; molecular dynamics; matrix relaxation	the structures are based on a total of 1689 restraints, 283 are NOE-derived distance constraints, 3 negative restraints, 84 dihedral angle restraints,104 distance restraints from hydrogen bonds, 243 intensity restraints (each of five mixing times)	Felix

NMR Ensemble Information
Conformer Selection Criteria	all calculated structures submitted,back calculated data agree with experimental NOESY spectrum,structures with acceptable covalent geometry,structures with favorable non-bond energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	1 (fewest violations,lowest energy)

Additional NMR Experimental Information
Details	The experiments 1H-15N HMBC, 1H-13C HMBC, 1H-13C HSQC, 1H-13C sHMBC were performed for assignments

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	Felix	2000	Accelrys
2	refinement	X-PLOR	3.851	A.T.Brunger
3	collection	VNMR	6.1	Varian