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Structure of a two-G-tetrad basket-type intramolecular G-quadruplex formed by human telomeric repeats in K+ solution
SOLUTION NMR
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*DGP*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*DGP*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*DGP*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*DGP*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*DGP*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
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
molecular dynamics
This natural sequence exhibits the same conformation as the 7BRG-substituted sequence, which has a much cleaner NMR spectrum. 10 relaxation matrix intensity-refined structures of the 7BRG form with the lowest energy were taken, the bromine atoms were replaced with hydrogen atoms, and the structures were subsequently subjected to distance-retrained molecular dynamics refinement.