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Structure of bhpBR3, the BAFF-binding loop of BR3 embedded in a beta-hairpin peptide
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
2.9 mM bhpBR3 peptide
92% H2O, 8% D2O, 0.1 mM DSS, pH 4.5
no added salt
4.5
ambient
293
2
2D TOCSY
2.9 mM bhpBR3 peptide
92% H2O, 8% D2O, 0.1 mM DSS, pH 4.5
no added salt
4.5
ambient
293
3
DQF-COSY
2.9 mM bhpBR3 peptide
92% H2O, 8% D2O, 0.1 mM DSS, pH 4.5
no added salt
4.5
ambient
293
4
2D NOESY
2.9 mM bhpBR3 peptide
100% D2O, 0.1 mM DSS, pH 4.5
no added salt
4.5
ambient
293
5
COSY-35
2.9 mM bhpBR3 peptide
100% D2O, 0.1 mM DSS, pH 4.5
no added salt
4.5
ambient
293
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DRX
600
NMR Refinement
Method
Details
Software
hybrid distance geometry/simulated annealing followed by restrained molecular dynamics.
Complete 1H resonance assignments were obtained using standard 2D homonuclear NMR methods. Distance restraints were derived from analysis of a 2D NOESY spectrum (250ms mixing time); HN-Ha coupling constants were obtained from analysis of a DQF-COSY spectrum acquired in water; and HaHb values were obtained from analysis of a COSY-35 spectrum acquired in D2O.
Structures were calculated from a total of 119 NOE-derived (including 46 long-range) distance restraints and 16 dihedral angle restraints. Structures satisfy the experimental data very well with no distance or dihedral angle violations greater than 0.1 angstrom or 1 degree, respectively.