1P7M

SOLUTION STRUCTURE AND BASE PERTURBATION STUDIES REVEAL A NOVEL MODE OF ALKYLATED BASE RECOGNITION BY 3-METHYLADENINE DNA GLYCOSYLASE I

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_13C-separated_NOESY	0.5-1mM 13C, 15N, 75% 2H labeled3-methyladenine DNA glycosylase I, 100mM Nacl, 3mM DTT, 0.34mM NaN3, 10mM phosphate buffer, pH6.6 ~8, fold ( or 13C8 labeled) 3-methyladenine	H20	10mM phosphate buffer	6.6	ambient	293
2	3D_15N-separated_NOESY	0.5-1mM 13C, 15N, 75% 2H labeled3-methyladenine DNA glycosylase I, 100mM Nacl, 3mM DTT, 0.34mM NaN3, 10mM phosphate buffer, pH6.6 ~8, fold ( or 13C8 labeled) 3-methyladenine	H20
3	2D NOESY	0.5-1mM 13C, 15N, 75% 2H labeled3-methyladenine DNA glycosylase I, 100mM Nacl, 3mM DTT, 0.34mM NaN3, 10mM phosphate buffer, pH6.6 ~8, fold ( or 13C8 labeled) 3-methyladenine	H20
4	13C-edited HSQC	0.5-1mM 13C, 15N, 75% 2H labeled3-methyladenine DNA glycosylase I, 100mM Nacl, 3mM DTT, 0.34mM NaN3, 10mM phosphate buffer, pH6.6 ~8, fold ( or 13C8 labeled) 3-methyladenine	H20

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	500
2	Bruker	DMX	600
3	Varian	UNITYPLUS	500
4	Varian	INOVA	600
5	Bruker	DMX	750

NMR Refinement
Method	Details	Software
torsion angle dynamics	the structures are based on a total of 2494 restraints, 2140 are NOE-derived distance constraints, 222 dihedral angle restraints, 132 h-bond constraints	CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with acceptable covalent geometry,structures with favorable non-bond energy,structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	200
Conformers Submitted Total Number	25
Representative Model	8 (lowest energy)

Additional NMR Experimental Information
Details	1H-13C HMQC

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CNS	1.1	Brunger, A.T., Adams, P.D., Clore, G.M., Delano, W.L., Gros, P., Grosse-Kunstleve, R.W., Jiang, J.-S., Kuszewski, J., Nilges, M., Pannu, N.S., Read, R.J., Rice, L.M., Simonson, T., Warren, G.L.
2	refinement	X-PLOR	NIH-2.0.2	Clore, G.M., Kuszewski, J.
3	data analysis	Sparky	3.93	Goddard, T.D., Kneller, D.G.
4	processing	NMRPipe	NIH	Delaglio, F.

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 R01GM157729.