1PT4
Solution structure of the Moebius cyclotide kalata B2
SOLUTION NMR
NMR Experiment | ||||||||
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Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
1 | 2D TOCSY | 2mM kalata B2 in 0.5ml | 70% H2O, 20% CH3CN, 10% D2O | 0 | 4 | ambient | 298 | |
2 | 2D NOESY | 2mM kalata B2 in 0.5ml | 70% H2O, 20% CH3CN, 10% D2O | 0 | 4 | ambient | 298 | |
3 | DQF-COSY | 2mM kalata B2 in 0.5ml | 70% H2O, 20% CH3CN, 10% D2O | 0 | 4 | ambient | 298 | |
4 | 2D TOCSY | 2mM kalata B2 in 0.5ml | 80% D2O, 20% CH3CN | 0 | 4 | ambient | 298 | |
5 | 2D NOESY | 2mM kalata B2 in 0.5ml | 80% D2O, 20% CH3CN | 0 | 4 | ambient | 298 | |
6 | 2D TOCSY | 2mM kalata B2 in 0.5ml | 70% H2O, 20% CH3CN, 10% D2O | 0 | 4 | ambient | 290 |
NMR Spectrometer Information | |||
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Spectrometer | Manufacturer | Model | Field Strength |
1 | Bruker | ARX | 500 |
2 | Bruker | DMX | 750 |
NMR Refinement | ||
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Method | Details | Software |
Simulated annealing using both torsion angle and Cartesian dynamics. | Structure was calculated using torsion angle dynamics within CNS and subsequently refined and energy minimised in a water shell using Cartesian dynamics in CNS according to protocols by Linge and Nilges (ARIA). | 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 | 20 |
Representative Model | 1 (lowest energy) |
Additional NMR Experimental Information | |
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Details | This structure was determined using standard 2D homonuclear techniques. |
Computation: NMR Software | ||||
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# | Classification | Version | Software Name | Author |
1 | collection | XwinNMR | 2.6 | Bruker |
2 | data analysis | XEASY | 1.3.7 | Eccles, C., Guntert, P., Billeter, M. and Wuthrich, K. |
3 | structure solution | DYANA | 1.5 | Guntert, P., Mumenthaler, C. and Wuthrich, K. |
4 | refinement | CNS | 1.0 |