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Solution structure of U2 snRNA stem I from S. cerevisiae
NMR Experiment Experiment Type Sample Contents Solvent Ionic Strength pH Pressure Temperature (K) Spectrometer 1 2D NOESY 0.5 mM unlabeled RNA; 50 mM NaCl; 90% H2O, 10% D2O 90% H2O/10% D2O 50 mM NaCl 7.0 ambient 283 2 2D NOESY 0.5 mM unlabeled RNA; 50 mM NaCl; 99.99% D2O 99.99% D2O 50 mM NaCl 7.0 ambient 303 3 2D HNC(O) 0.5 mM 13C/15N RNA; 50 mM NaCl; 90% H2O, 10% D2O 90% H2O/10% D2O 50 mM NaCl 7.0 ambient 283 4 2D HCC 0.5 mM 13C/15N RNA; 50 mM NaCl; 99.99% D2O 99.99% D2O 50 mM NaCl 7.0 ambient 303 5 2D 13C-1H CT-HSQC 0.5 mM 13C/15N RNA; 50 mM NaCl; 99.99% D2O 99.99% D2O 50 mM NaCl 7.0 ambient 303 6 3D 13C-separated TOCSY 0.5 mM 13C/15N RNA; 50 mM NaCl; 99.99% D2O 99.99% D2O 50 mM NaCl 7.0 ambient 303
NMR Spectrometer Information Spectrometer Manufacturer Model Field Strength 1 Bruker DMX 750 2 Varian INOVA 900
NMR Refinement Method Details Software simulated annealing
molecular dynamics
torsion angle dynamics CNS
NMR Ensemble Information Conformer Selection Criteria structures with the lowest energy Conformers Calculated Total Number 100 Conformers Submitted Total Number 20 Representative Model 1 (lowest energy)
Computation: NMR Software # Classification Version Software Name Author 1 structure solution CNS 1.1 Brunger, Adams, Clore, Delano, Gros, Grossekunstleve, Jiang, Kuszewski, Nilges, Pannu, Read, Rice, Simonson, Warren 2 refinement X-PLOR 2.11.0 Schwieters, Kuszewski, Tjandra, Clore