2N4N
NMR structure for a 3-stranded parallel beta-sheet
SOLUTION NMR
NMR Experiment | ||||||||
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Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
1 | 2D 1H-1H COSY | 2 mM protein_1, 2.5 mM acetic acid | 90% H2O/10% D2O | 3.8 | ambient | 277 | ||
2 | 2D 1H-1H TOCSY | 2 mM protein_1, 2.5 mM acetic acid | 90% H2O/10% D2O | 3.8 | ambient | 277 | ||
3 | 2D 1H-1H ROESY | 2 mM protein_1, 2.5 mM acetic acid | 90% H2O/10% D2O | 3.8 | ambient | 277 |
NMR Spectrometer Information | |||
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Spectrometer | Manufacturer | Model | Field Strength |
1 | Varian | INOVA | 600 |
NMR Refinement | ||
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Method | Details | Software |
simulated annealing | X-PLOR NIH |
NMR Ensemble Information | |
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Conformer Selection Criteria | structures with the lowest energy |
Conformers Calculated Total Number | 100 |
Conformers Submitted Total Number | 10 |
Representative Model | 1 (lowest energy) |
Additional NMR Experimental Information | |
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Details | The authors state that the structures of these peptides in solution are more dynamic than are typical of well-ordered globular proteins such that the ROE intensities represent averages over multiple conformers. However, the authors make the simplifying assumption of there being a single set of structures. One result of this assumption is that reported clash scores are poorer than those typical of standard PDB structures. Warnings about residues that 'are not properly linked' and 'missing atoms' occur where there are non-natural residues and reversals in the chain directions, and there are no real problems with these stretches. |
Computation: NMR Software | ||||
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# | Classification | Version | Software Name | Author |
1 | structure solution | X-PLOR NIH | 2.35 | Schwieters, Kuszewski, Tjandra and Clore |
2 | refinement | X-PLOR NIH | 2.35 | Schwieters, Kuszewski, Tjandra and Clore |