SOLUTION NMR
| NMR Experiment | ||||||||
|---|---|---|---|---|---|---|---|---|
| Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
| 1 | 2D NOESY | 6 mM P22 Cro, 50 mM sodium phosphate buffer, 90% H2O, 10% D2O | 90% H2O/10% D2O | 50 mM sodium phosphate | 6.4 | ambient | 293 | |
| 2 | HNHA | 3.5 mM P22 Cro U-15N, 50 mM sodium phosphate buffer, 90% H2O, 10% D2O | 90% H2O/10% D2O | 50 mM sodium phosphate | 6.4 | ambient | 293 | |
| 3 | HNHB | 3.5 mM P22 Cro U-15N, 50 mM sodium phosphate buffer, 90% H2O, 10% D2O | 90% H2O/10% D2O | 50 mM sodium phosphate | 6.4 | ambient | 293 | |
| 4 | 3D_15N-separated_NOESY | 3.5 mM P22 Cro U-15N, 50 mM sodium phosphate buffer, 90% H2O, 10% D2O | 90% H2O/10% D2O | 50 mM sodium phosphate | 6.4 | ambient | 293 | |
| 5 | 3D_13C-separated_NOESY | 2.75 mM P22 Cro U-15N, 13C, 50 mM sodium phosphate buffer, 90% H2O, 10% D2O | 90% H2O/10% D2O | 50 mM sodium phosphate | 6.4 | ambient | 293 | |
| 6 | hydrogen exchange | 3.5 mM P22 Cro U-15N, 50 mM sodium phosphate buffer | 100% D2O | 50 mM sodium phosphate | 6.4 | ambient | 293 | |
| NMR Spectrometer Information | |||
|---|---|---|---|
| Spectrometer | Manufacturer | Model | Field Strength |
| 1 | Bruker | DRX | 600 |
| NMR Refinement | ||
|---|---|---|
| Method | Details | Software |
| simulated annealing | 30 structures were calculated using 916 NOE-derived distance restraints, 10 hydrogen bond distance restraints, 41 phi angle restraints and 5 chi1 angle restraints. 23 of 30 calculated structures were initially accepted based on no distance restraint violations greater than 0.4 angstroms and no angle restraint violations greater than 5 degrees. Of the 23, 2 were eliminated for having significantly higher energy than the others, leaving 21 structures in the final ensemble. The ordered region of the structure includes residues 1-57. Pairwise RMSDs for the ordered region were 0.53 A (backbone atoms) and 1.29 A (all heavy atoms). None of the backbone angles in the ordered region of any ensemble member fell outside the most favorable and additionally allowed regions of a Ramachandran plot. | XwinNMR |
| NMR Ensemble Information | |
|---|---|
| Conformer Selection Criteria | agreement with distance and angle restraints; two structures were also eliminated due to high energy |
| Conformers Calculated Total Number | 30 |
| Conformers Submitted Total Number | 21 |
| Representative Model | 1 (closest to the average) |
| Computation: NMR Software | ||||
|---|---|---|---|---|
| # | Classification | Version | Software Name | Author |
| 1 | collection | XwinNMR | 3.1 | Bruker |
| 2 | processing | NMRPipe | F. Delaglio et al | |
| 3 | data analysis | NMRView | 4.1.3 | B. Johnson |
| 4 | structure solution | CNS | 1.1 | A. Brunger et al |
| 5 | refinement | CNS | 1.1 | A. Brunger et al |
