SOLUTION NMR Experimental Data


Experimental Details
Sample Conditions
Sample Contents1mM U2 snRNA-intron duplex; 10mM sodium phosphate
Solvent90% H2O, 10% D2O
Ionic Strength50mM sodium chloride
pH6.4
Pressureambient
Temperature (K)278
Experiment(s):2D NOESY
Sample Contents1mM U2 snRNA-intron duplex; 10mM sodium phosphate
Solvent100% D2O
Ionic Strength50mM sodium chloride
pH6.4
Pressureambient
Temperature (K)293
Experiment(s):2D NOESY, 2D TOCSY, DQF-COSY
Spectrometer Information
Manufacturer Model Field Strength
Varian UNITYplus 720.0
Varian UNITYplus 720.0
NMR Refinement
Method torsion angle molecular dynamics followed by conjugate gradient minimization
Details A total of 191 distance restraints were used, not including the 40 hydrogen bond distances imposed. Including the 133 dihedral restraints applied in structure calculations, 353 total restraints were applied.
NMR Ensemble Information
Conformer Selection Criteria lowest energy structures that did not violate data from fluorescence experiments
Conformers Calculated Total Number 800
Conformers Submitted Total Number 9
Representative Model Choice Rationale
1 lowest energy structure that agreed best with experimental data
Additional NMR Experimental Information
1 This structure was determined using standard 2D homonuclear techniques. NOESY spectra were collected at many different mixing times, so that the buildup of certain NOEs could be observed to resolve some spectral overlap.
Computation: NMR Software
# Classification Software Name Author
1 structure solution VNMR 3.851 Axel Brunger
2 refinement X-PLOR 3.851 Brunger
3 data analysis SPARKY 3.69 T.D. Goddard and D.G. Kneller
4 collection VNMR 5.3 Varian, Inc.