1N0A
Turn stability in beta-hairpin peptides: 3:5 type I G1 bulge turns
SOLUTION NMR
NMR Experiment | ||||||||
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Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
1 | 2D ROESY | 8 mM peptide, no buffer | 90% H2O/10% D2O | 0 | 5.0 | 1 atm | 303 | |
2 | 2D TOCSY | 8 mM peptide, no buffer | 90% H2O/10% D2O | 0 | 5.0 | 1 atm | 303 | |
3 | DQF-COSY | 8 mM peptide, no buffer | 90% H2O/10% D2O | 0 | 5.0 | 1 atm | 303 | |
4 | 2D ROESY | 8 mM peptide, no buffer | 100% D2O | 0 | 5.0 | 1 atm | 303 | |
5 | 2D COSY-35 | 8 mM peptide, no buffer | 100% D2O | 0 | 5.0 | 1 atm | 303 | |
6 | 2D 13C-HMQC | 8 mM peptide, no buffer | 100% D2O | 0 | 5.0 | 1 atm | 303 |
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 |
distance geometry and restrained molecular dynamics | 100 distance geometry structures were calculated. The 80 structures of lowest penalty function were further refined using restrained molecular dynamics. The 20 structures of lowest restraint violation energy were used to describe the structure. 61 distance and 21 dihedral angle restraints were used. The final ensemble has no distance violations greater than 0.1 A and no dihedral angle vioaltions greater than 1 degree. 95% of the residues are in the most favourable region of the Ramachandran plot. The mean backbone atom rmsd to the mean structure is 0.29+/-0.05 A. | DGII |
NMR Ensemble Information | |
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Conformer Selection Criteria | structures with the least restraint violations |
Conformers Calculated Total Number | 80 |
Conformers Submitted Total Number | 21 |
Representative Model | 3 (closest to the average) |
Additional NMR Experimental Information | |
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Details | This structure was determined using standard 2D homonuclear techniques augmented by loose phi and psi restraints generated from TALOS. MODEL 21 is the average minimized structure. |
Computation: NMR Software | ||||
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# | Classification | Version | Software Name | Author |
1 | structure solution | DGII | 98.0 | Tim Havel |
2 | refinement | Discover | 3.0 | Accelrys |
3 | data analysis | NMRPipe | 2001 | Frank Delaglio |
4 | data analysis | Felix | 98.0 | Accelrys |
5 | collection | XwinNMR | 3.1 | Bruker |