1F9L

Solution Structure of a 22-Nucleotide Hairpin Similar to the P5ABC Region of a Group I Ribozyme with Cobalt(III)hexammine Complexed to the GAAA Tetraloop

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2.8 mM RNA, 10 mM sodium Phosphate, 200 mM NaCl, 0.1 mM EDTA pH 5.6, 3.4 mM Cobalt(III)Hexammine	90% H2O/10% D2O	200 mM NaCl	5.6	ambient	283

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	600
2	Bruker	DRX	500

NMR Refinement
Method	Details	Software
restrained molecular dynamics,	356 NOE constraints, 16 sugar pucker constraints, 93 torsion angle constraints, 7 constraints between Cobalt(III)Hexammine and the GAAA tetraloop	X-PLOR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	50
Conformers Submitted Total Number	1
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	The structure of the complex was determined using 7 NOE constraints between Cobalt(III)Hexammine and the GAAA tetraloop. In addition, the same constraints as for the 22-nucleotide hairpin without Cobalt(III)hexammine were used. For RNA without Cobalt(III)Hexammine see entry 1EOR.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	X-PLOR	3.1	Brunger
2	data analysis	Felix	95	MSI
3	refinement	X-PLOR	3.1	Brunger