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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
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.