1HT4

SOLUTION STRUCTURE OF A BISTRAND ABASIC SITE LESION STAGGERED IN A 3'-ORIENTATION.

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2mM solution; 20 mM phosphate buffer, pH 6.8; 50 mM NaCl; 1 mM EDTA.	99.96% D2O	not determined	6.8	ambient	298
2	COSY, COSY45, TOCSY, HETCOR	2mM solution; 20 mM phosphate buffer, pH 6.8; 50 mM NaCl; 1 mM EDTA.	99.96% D2O	not determined	6.8	ambient	298
3	2D NOESY	2mM solution; 20 mM phosphate buffer, pH 6.8; 50 mM NaCl; 1 mM EDTA.	99.96% D2O	not determined	6.8	ambient	280

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

NMR Refinement
Method	Details	Software
restrained molecular dynamics	1) Heating stage: from 100 to 500 K in 4ps. Introduction of experimental restraints at the end of this stage. 2) High temperature stage: 80 ps dynamics at 500K. 3) Cooling stage: From 500 to 300 K in 40 ps. 4) Equilibration stage: 140 ps dynamics at 300K.	Felix

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	30
Conformers Submitted Total Number	6

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	Felix	98	MSI
2	refinement	X-PLOR	3.1	A. Brunger
3	data analysis	MARDIGRAS	5	Borgia & James
4	data analysis	Curves	5.1	Sklenar & Lavery
5	data analysis	MIDAS	Plus	UCSF
6	data analysis	Insight	95	MSI