6RLS

Concerted dynamics of metallo-base pairs in an A/B-form helical transition (apo species)

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H NOESY	0.3 mM polydeoxyribonucleotide	90% H2O/10% D2O	50 mM	7.75	ambient atm	278	Bruker AVANCE 700
2	2D 1H-1H NOESY	0.3 mM polydeoxyribonucleotide	100% D2O	50 mM	7.35	ambient atm	298	Bruker AVANCE 700
3	2D 1H-1H TOCSY	0.3 mM polydeoxyribonucleotide	100% D2O	50 mM	7.35	ambient atm	298	Bruker AVANCE 700

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	700

NMR Refinement
Method	Details	Software
simulated annealing	2000 preliminary structures were calculated. The 20 lowest energy structures were selected and subsequently refined. Of the 200 refined conformers calculated the 21 lowest energy structures were chosen	Xplor-NIH

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	200
Conformers Submitted Total Number	20
Representative Model	1 (fewest violations)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	TopSpin	4.0.3	Bruker Biospin
2	structure calculation	Xplor-NIH	2.46	Schwieters, Kuszewski, Tjandra and Clore
3	chemical shift assignment	Sparky		Goddard
4	peak picking	Sparky		Goddard
5	refinement	Xplor-NIH	2.46	Schwieters, Kuszewski, Tjandra and Clore

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.