SOLUTION NMR Experimental Data

Experimental Details
Sample Conditions
Sample Contents2.0 mM replicase operator RNA U-15N,13C at U, C, and G, unlabeled A; phosphorothioate 5' to each adenine;; 10 mM KPi buffer; 10 mM NaCl; 0.2 mM EDTA
Solvent90% H2O/10% D2O
Ionic Strength~50mM
Temperature (K)298
Experiment(s):2D NOESY, 3D_15N-separated_NOESY
Spectrometer Information
Manufacturer Model Field Strength
Bruker AMX 500.0
NMR Refinement
Method simulated annealing and molecular dynamics refinement
Details structures were calculated using 313 conformationally restrictive NOE distance constraints (i.e., intra-residue sugar-sugar NOEs are not included), 20 H-bond base pair constraints, 30 backbone dihedral restraints, and dihedral restraints to restrict sugar pucker conformation. Parameter file was modified to incorporate bond-length, bond-angle, charge, van der Waal's radius for the Rp phosphoryl sulfur atoms located 5' to each adenine in the sequence. [Jaroszewski, JW., et al., Anti-Cancer Drug Design ( 1992) 7, 253; Florian, J. et al., J. Am. Chem. Soc. (1998) 120, 7959].
NMR Ensemble Information
Conformer Selection Criteria back calculated data agree with experimental NOESY spectrum,structures with acceptable covalent geometry,structures with the least restraint violations, structures with the lowest energy
Conformers Calculated Total Number 30
Conformers Submitted Total Number 10
Representative Model Choice Rationale
1 minimized average structure
Additional NMR Experimental Information
1 The structure was determined using standard 2D homonuclear and 2D/3D heteronuclear techniques. Filtered experiments used to identify inter-residue NOEs involving unlabeled A residues
Computation: NMR Software
# Classification Software Name Author
1 collection version: 1994 UXNMR Spectraspin
2 processing version: 1998 FELIX Biosym-MSI
3 structure solution version: 3.851 X-PLOR Brunger
4 refinement version: 3.851 X-PLOR Brunger