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Structure of a two-G-tetrad basket-type intramolecular G-quadruplex formed by human telomeric repeats in K+ solution (with G7-to-BRG substitution)
NMR Experiment Experiment Type Sample Contents Solvent Ionic Strength pH Pressure Temperature (K) Spectrometer 1 2D 1H-13C HSQC 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6 100% D2O 7 298 2 2D 1H-1H TOCSY 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6 100% D2O 7 298 3 2D 1H-1H COSY 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6 100% D2O 7 298 4 2D 1H-1H NOESY 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-1, 70mM potassium chloride-2, 20mM potassium phosphate-3 90% H2O/10% D2O 7 298 5 2D 1H-1H NOESY 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6 100% D2O 7 298 6 2D 1H-1H NOESY 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-4, 70mM potassium chloride-5, 20mM potassium phosphate-6 100% D2O 5 283 7 2D 1H-15N HSQC 0.5-2.5mM DNA (5'-D(*DGP*DGP*DGP*DTP*DTP*DAP*(BGM)P*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DTP*DTP*DAP*DGP*DGP*DGP*DT)-3')-1, 70mM potassium chloride-2, 20mM potassium phosphate-3 90% H2O/10% D2O 7 298
NMR Spectrometer Information Spectrometer Manufacturer Model Field Strength 1 Bruker AVANCE 600 2 Bruker AVANCE 700 3 Varian INOVA 600
NMR Refinement Method Details Software matrix relaxation, molecular dynamics, DGSA-distance geometry simulated annealing Felix
NMR Ensemble Information Conformer Selection Criteria back calculated data agree with experimental NOESY spectrum Conformers Calculated Total Number 100 Conformers Submitted Total Number 10 Representative Model 1 (lowest energy)
Computation: NMR Software # Classification Version Software Name Author 1 peak picking Felix 2007 Felix NMR, Inc. 2 processing TopSpin Bruker Biospin 3 structure solution X-PLOR NIH 2.21 Schwieters, Kuszewski, Tjandra, Clore 4 refinement X-PLOR NIH 2.21 Schwieters, Kuszewski, Tjandra, Clore