2KF8
Structure of a two-G-tetrad basket-type intramolecular G-quadruplex formed by human telomeric repeats in K+ solution
SOLUTION NMR
NMR Experiment | ||||||||
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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 | |||
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Spectrometer | Manufacturer | Model | Field Strength |
1 | Bruker | AVANCE | 600 |
2 | Bruker | AVANCE | 700 |
3 | Varian | INOVA | 600 |
NMR Refinement | ||
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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. | Felix |
NMR Ensemble Information | |
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Conformer Selection Criteria | all calculated structures submitted |
Conformers Calculated Total Number | 10 |
Conformers Submitted Total Number | 10 |
Representative Model | 1 (lowest energy) |
Computation: NMR Software | ||||
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# | 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 |