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Solution structure of the unmodified U2 snRNA-intron branch site helix from S. cerevisiae
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA
90% H2O/10% D2O
50mM sodium chloride
6.4
ambient
278
2
2D NOESY
1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA
100% D2O
50mM sodium chloride
6.4
ambient
293
3
2D TOCSY
1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA
100% D2O
50mM sodium chloride
6.4
ambient
293
4
DQF-COSY
1mM unmodified U2 snNRA - intron branch site duplex, 10mM sodium phosphate, 0.1mM EDTA
100% D2O
50mM sodium chloride
6.4
ambient
293
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
UNITYPLUS
720
NMR Refinement
Method
Details
Software
torsion angle molecular dynamics, followed by congugate gradient minimization
VNMR
NMR Ensemble Information
Conformer Selection Criteria
structures with the lowest energy
Conformers Calculated Total Number
300
Conformers Submitted Total Number
10
Representative Model
2 (lowest energy)
Additional NMR Experimental Information
Details
This structure was determined using standard 2D homonuclear techniques. NOESY spectra were collected at many different mixing times to assess the buildup rate of each NOE, thereby resolving some of the spectral overlap.