1K43
10 Structure Ensemble of the 14-residue peptide RG-KWTY-NG-ITYE-GR (MBH12)
SOLUTION NMR
NMR Experiment | ||||||||
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Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
1 | 2D ROESY | 1 mM Peptide MBH12 | 90% H2O/10% D2O | 0 | 5.0 | ambient | 283 | |
2 | 2D NOESY | 1 mM Peptide MBH12 | 100% D2O | 0 | 5.0 | ambient | 283 | |
3 | 2D NOESY | 1 mM Peptide MBH12 | 40% CD3OD, 60% H2O | 0 | 5.0 | ambient | 283 |
NMR Spectrometer Information | |||
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Spectrometer | Manufacturer | Model | Field Strength |
1 | Bruker | DRX | 500 |
NMR Refinement | ||
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Method | Details | Software |
simulated annealing combined with torsion angle dynamics (DYANA) | The structures are based on a total of 70 restraints, 60 are NOE-derived distance constraints and 10 dihedral angle restraints. The pairwise RMSD for residues 3-12 was 0.38 +/- 0.21 A for the backbone and 1.36 +/- 0.35 A for all heavy atoms. The estimated beta-hairpin population of this peptide is 66 +/- 4%. The first and last two residues (RG) are disordered, because they were added just to avoid aggregation. The side chains of Trp4, Tyr6, Ile9 and Tyr11 are interacting in one side of the beta hairpin, forming a hydrophobic cluster. Asn7 at position L1 of the beta-turn is directed outwards from the beta-hairpin, as expected for a type I' beta-turn. | XwinNMR |
NMR Ensemble Information | |
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Conformer Selection Criteria | structures with the lowest energy |
Conformers Calculated Total Number | 50 |
Conformers Submitted Total Number | 10 |
Representative Model | 6 (lower rmsd with respect to mean) |
Computation: NMR Software | ||||
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# | Classification | Version | Software Name | Author |
1 | collection | XwinNMR | 2.6 | Bruker |
2 | data analysis | XwinNMR | 2.6 | Bruker |
3 | structure solution | DYANA | 1.5 | Guntert, P. et al. |
4 | refinement | GROMOS | 96 | van Gunsteren |