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HYPERMODIFIED NUCLEOSIDES IN THE ANTICODON OF TRNALYS STABILIZE A CANONICAL U-TURN STRUCTURE
NMR Experiment Experiment Type Sample Contents Solvent Ionic Strength pH Pressure Temperature (K) Spectrometer 1 2D NOESY 1.5mM natural abundance RNA; 10mM phosphate buffer; 50mM KCl; 50mM NaCl; 10mM MgCl2 90% H2O/10% D2O 120mM 7 ambient 285 2 2D NOESY 1.5mM natural abundance RNA; 10mM phosphate buffer; 50mM KCl; 50mM NaCl; 10mM MgCl2 90% H2O/10% D2O 120mM 7 ambient 303 3 DQF-COSY 1.5mM natural abundance RNA; 10mM phosphate buffer; 50mM KCl; 50mM NaCl; 10mM MgCl2 90% H2O/10% D2O 120mM 7 ambient 303 4 1H-31P-COSY 1.5mM natural abundance RNA; 10mM phosphate buffer; 50mM KCl; 50mM NaCl; 10mM MgCl2 90% H2O/10% D2O 120mM 7 ambient 303 5 1H-31P-hetero-TOCSY-TOCSY 1.5mM natural abundance RNA; 10mM phosphate buffer; 50mM KCl; 50mM NaCl; 10mM MgCl2 90% H2O/10% D2O 120mM 7 ambient 303
NMR Spectrometer Information Spectrometer Manufacturer Model Field Strength 1 Varian UNITYPLUS 600 2 Varian UNITY 500
NMR Refinement Method Details Software used H5-H6 distances for distance calculations then simulated annealing/molecular dynamics in vacuo then restrained minimization in vacuo 123 NOE-derived restraints, 15 hydrogen bond restraints, 102 lower/upper bound restraints, 161 dihedral restraints, 68 chiral restraints VNMR
NMR Ensemble Information Conformer Selection Criteria structures with the lowest energy Conformers Calculated Total Number 35 Conformers Submitted Total Number 20 Representative Model 4 (closest to the average,lowest energy)
Additional NMR Experimental Information Details This structure was determined using standard 2D homonuclear techniques and standard 1H-31P 2D correlation experiments.
Computation: NMR Software # Classification Version Software Name Author 1 collection VNMR 6.1B Varian 2 processing VNMR 6.1B Varian 3 data analysis VNMR 6.1B Varian 4 processing Felix MSI 5 data analysis Felix MSI 6 structure solution Discover MSI 7 refinement Discover MSI