1N1N

Structure of Mispairing of the Deoxycytosine with Deoxyadenosine 5' to the 8,9-Dihydro-8-(N7-guanyl)-9-Hydroxy-Aflatoxin B1 Adduct

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	the sample was dissolved in 0.5 mL of 0.01 M sodium phosphate buffer for NMR containing 0.1 M NaCl and 0.05 mM Na2EDTA at pH 7.2	The sample was dissolved in 99.96% D2O.	0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA	7.2	ambient	278
2	DQF-COSY	the sample was dissolved in 0.5 mL of 0.01 M sodium phosphate buffer for NMR containing 0.1 M NaCl and 0.05 mM Na2EDTA at pH 7.2	The sample was dissolved in 99.96% D2O.	0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA	7.2	ambient	278
3	P-COSY	the sample was dissolved in 0.5 mL of 0.01 M sodium phosphate buffer for NMR containing 0.1 M NaCl and 0.05 mM Na2EDTA at pH 7.2	The sample was dissolved in 99.96% D2O.	0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA	7.2	ambient	278
4	2D NOESY	the sample was dissolved in 0.5 mL of 0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA at pH 6.7 for NMR studies	The sample was dissolved in 99.96% D2O.	0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA	6.7	ambient	278
5	2D NOESY	the ample was dissolved in 0.5 mL of 0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA at pH 7.2 for NMR studies	the sample was dissolved in 9:1 H2O:D2O.	0.01 M sodium phosphate buffer containing 0.1 M NaCl and 0.05 mM Na2EDTA	7.2	ambient	278

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	500
2	Bruker	AVANCE	600
3	Bruker	AVANCE	800

NMR Refinement
Method	Details	Software
distance geometry simulated annealing NMR data : Felix 97, 2000 molecular dynamics : XPLOR, AMBER matrix relaxation CORMA torsion angle dynamics Gaussian 98, INSIGHTII (2000)	Distance was calculated using RANDMARDI protocol from MARDIGRAS. The 20 structures obtained from molecular dynamics simulation using X-PLOR starting from random, and B-starting structures. The final structure emerged from average of 20 simulated annealing structure from B-form starting structure. The average structure was solvated using X-LEAP protocol in AMBER 6.0, and subjected to 1.4 ns MD simulation using AMBER 6.0 SANDER module, in presence of counter IONs. The final structure was obtained by energy minimization of simulated structure. Solvent, and counter ions were omitted. Back Calculations were performed using CORMA.	X-PLOR

NMR Ensemble Information
Conformer Selection Criteria
Conformers Calculated Total Number	20
Conformers Submitted Total Number	1
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR	6.5	Brunger
2	structure solution	Insight II	2000	Accelaris Inc
3	data analysis	Felix	97, 2000	Accelaris INC
4	iterative matrix relaxation	MARDIGRAS	5.2, 6.2	Borgias, B. A., & James, T. L.
5	refinement	Amber	6.0	Case
6	collection	XwinNMR	3	Bruker Inc

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.