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. | XwinNMR |
| NMR Ensemble Information | |
|---|---|
| Conformer Selection Criteria | structures with the least restraint violations |
| Conformers Calculated Total Number | 80 |
| Conformers Submitted Total Number | 20 |
| Representative Model | 1 (closest to the average) |
| Computation: NMR Software | ||||
|---|---|---|---|---|
| # | Classification | Version | Software Name | Author |
| 1 | collection | XwinNMR | 1.37.4.2 | Bruker |
| 2 | data analysis | Felix | 98.0 | Accelrys |
| 3 | structure solution | DGII | 98.0 | Accelrys |
| 4 | refinement | Discover | 98.0 | Accelrys |
