2I7E

GAAA tetralooop receptor complex with associated cobalt hexammine.

SOLUTION NMR

---

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1 mM GAAA tetraloop receptor RNA, 10 mM MgCl2, 2 mM cobalt hexaamine, 50 mM NaCl, pH 7.0; 90% H2O 10 %D2O	90% H2O/10% D2O		7.0	ambient	283
2	2D HMQC	1 mM GAAA tetraloop receptor RNA, 10 mM MgCl2, 2 mM cobalt hexaamine, 50 mM NaCl, pH 7.0; 90% H2O 10 %D2O	90% H2O/10% D2O		7.0	ambient	283

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	750
2	Varian	INOVA	900
3	Bruker	DMX	600

NMR Refinement
Method	Details	Software
structures were subjected to 60 ps (15 fs time steps) of restrained molecular dynamics in torsion angle space, followed by 90 ps of slow cooling. Finally 30 ps (5 fs time steps) of restrained molecular dynamics in Cartesian coordinate space were performed		CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	CNS	1.0	Brunger A. T. etall
2	refinement	X-PLOR	2.11
3	processing	XwinNMR	2.6
4	data analysis	Sparky	3.111