Experiment: 1OO7

DNA.RNA HYBRID DUPLEX CONTAINING A 5-PROPYNE DNA STRAND AND PURINE-RICH RNA STRAND, NMR, 4 STRUCTURES

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	NOESY		100% D2O OR 90% H2O, 10% D2O	100 mM KCL	7.0	1 atm	303
2	COSY		100% D2O OR 90% H2O, 10% D2O	100 mM KCL	7.0	1 atm	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITY	500
2	Varian	UNITYPLUS	600

NMR Refinement
Method	Details	Software
MULTIPLE STARTING CONFORMATIONS	DISTANCE CONSTRAINTS FOR GLYCOSIDIC TORSION ANGLES, PENTOSE PSEUDOROTATIONAL PHASE ANGLES/AMPLITUDES AND FRACTION OF SOUTH STATE SUGARS CALCULATED FROM NOE BUILD-UP CURVES AND COUPLING CONSTANTS BY A LEAST-SQUARES/GRID SEARCH METHOD IMPLEMENTED IN NUCFIT AND PFIT (A.N. LANE, NIMR, UK). TEN DIFFERENT SETS OF UNIQUE RESTRAINTS GENERATED 10 STRUCTURES, THE AVERAGE OF WHICH SATISFIED THE EXPERIMENTALLY DERIVED FRACTION OF SOUTH STATE SUGARS BETTER THAN STRUCTURES GENERATED FROM A SINGLE SET OF RESTRAINTS. INTERNUCLEOTIDE DISTANCE CONSTRAINTS CALCULATED FROM NOE-BUILD-UP CURVES. STRUCTURES CALCULATED BY SIMULATED ANNEALING/RMD PROTOCOL WITHIN DISCOVER 95.0 USING AN AMBER FORCE FIELD AND A DISTANCE DIELECTRIC CONSTANT.	Amber

NMR Ensemble Information
Conformer Selection Criteria	all calculated structures submitted
Conformers Calculated Total Number	4
Conformers Submitted Total Number	4
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	THE STRUCTURE WAS DETERMINED FROM 2D HOMONUCLEAR NMR EXPERIMENTS USING UNLABELLED SAMPLE

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	Amber	7.0	CORNELL, W.D., ET AL.
2	processing	Felix	95.0	Biosym
3	data analysis	NUCFIT		Lane, A.N.
4	data analysis	pfit		Conte, M.R., Bauer, C.J., Lane, A.N.