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 Experimental Data

Experimental Details
Sample Conditions
Sample Contents2.8 mM RNA, 10 mM sodium Phosphate, 200 mM NaCl, 0.1 mM EDTA pH 5.6, 3.4 mM Cobalt(III)Hexammine
Solvent90 % H2O, 10 % D2O
Ionic Strength200 mM NaCl
Temperature (K)283
Experiment(s):2D NOESY
Spectrometer Information
Manufacturer Model Field Strength
Bruker DRX 500.0
Bruker AMX 600.0
NMR Refinement
Method restrained molecular dynamics,
Details 356 NOE constraints, 16 sugar pucker constraints, 93 torsion angle constraints, 7 constraints between Cobalt(III)Hexammine and the GAAA tetraloop
NMR Ensemble Information
Conformer Selection Criteria structures with the least restraint violations
Conformers Calculated Total Number 50
Conformers Submitted Total Number 1
Representative Model Choice Rationale
1 minimized average structure
Additional NMR Experimental Information
1 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 Software Name Author
1 refinement X-PLOR 3.1 Brunger
2 data analysis FELIX 95 MSI
3 structure solution X-PLOR 3.1 Brunger