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Structure of an antiparallel (2+2) G-quadruplex formed by human telomeric repeats in Na+ solution (with G22-to-BrG substitution)
NMR Experiment Experiment Type Sample Contents Solvent Ionic Strength pH Pressure Temperature (K) Spectrometer 1 2D 1H-1H NOESY 1-2 mM DNA (27-MER) 100% D2O 100 mM NA+ 7.0 ambient 298 2 2D 1H-1H JR NOESY 1-2 mM DNA (27-MER) 90% H2O/10% D2O 100 mM NA+ 7.0 ambient 298 3 2D 1H-1H COSY 1-2 mM DNA (27-MER) 100% D2O 100 mM NA+ 7.0 ambient 298 4 2D 1H-1H TOCSY 1-2 mM DNA (27-MER) 100% D2O 100 mM NA+ 7.0 ambient 298 5 2D 1H-13C HSQC 1-2 mM DNA (27-MER) 100% D2O 100 mM NA+ 7.0 ambient 298 6 2D 1H-13C JR HMBC 1-2 mM DNA (27-MER) 90% H2O/10% D2O 100 mM NA+ 7.0 ambient 298 7 H-D EXCHANGE 1-2 mM DNA (27-MER) 90% H2O/10% D2O 100 mM NA+ 7.0 ambient 298 8 15N-FILTERED 0.5-2 mM [U-2% 15N] DNA (27-MER) 90% H2O/10% D2O 100 mM NA+ 7.0 ambient 298 9 D-LABELED 0.2-1 mM [U-100% 2H] DNA (27-MER) 90% H2O/10% D2O 100 mM NA+ 7.0 ambient 298
NMR Spectrometer Information Spectrometer Manufacturer Model Field Strength 1 Bruker AVANCE 600 2 Bruker AVANCE 700
NMR Refinement Method Details Software DGSA-distance geometry simulated annealing, Distance-restrained molecular dynamics TopSpin
NMR Ensemble Information Conformer Selection Criteria structures with the lowest energy Conformers Calculated Total Number 100 Conformers Submitted Total Number 10 Representative Model 1 (lowest energy)
Computation: NMR Software # Classification Version Software Name Author 1 processing TopSpin 2.1 Bruker Biospin 2 collection TopSpin 2.1 Bruker Biospin 3 peak picking Felix 2007 Felix NMR, Inc. 4 structure solution X-PLOR NIH 2.29 Schwieters, Kuszewski, Tjandra and Clore 5 refinement X-PLOR NIH 2.29 Schwieters, Kuszewski, Tjandra and Clore