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NMR structure of a new modified Thrombin Binding Aptamer containing a 5'-5' inversion of polarity site
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
20 mM phosphate buffer K, 70 mM KCl, 0.2 mM EDTA, 90% H2O, 10% D2O
90% H2O/10% D2O
7
ambient
298
2
2D NOESY
20 mM phosphate buffer K, 70 mM KCl, 0.2 mM EDTA, 90% H2O, 10% D2O
90% H2O/10% D2O
7
ambient
278
3
1H-15N HSQC
20 mM phosphate buffer K, 70 mM KCl, 0.2 mM EDTA, 90% H2O, 10% D2O
90% H2O/10% D2O
7
ambient
278
4
2D TOCSY
20 mM phosphate buffer K, 70 mM KCl, 0.2 mM EDTA
D2O
7
ambient
298
5
PE-COSY
20 mM phosphate buffer K, 70 mM KCl, 0.2 mM EDTA
D2O
7
ambient
298
6
2D NOESY
20 mM phosphate buffer K, 70 mM KCl, 0.2 mM EDTA
D2O
7
ambient
298
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
Unity Inova
700
2
Varian
Unity Inova
500
NMR Refinement
Method
Details
Software
simulated annealing
the structures are based on a total of 288 restraints, 198 are NOE-derived distance constraints, 54 dihedral angle restraints, 36 distance restraints
from hydrogen bonds.
Insight II
NMR Ensemble Information
Conformer Selection Criteria
structures with the lowest energy
Conformers Calculated Total Number
20
Conformers Submitted Total Number
7
Representative Model
1 (lowest energy)
Additional NMR Experimental Information
Details
This structure was determined using standard 2D homonuclear techniques, and by using a 1H-15N HSQC performed on the unlabeled molecule