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NMR structure for a 3-stranded parallel beta-sheet
SOLUTION NMR
NMR Experiment
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
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
INOVA
600
NMR Refinement
Method
Details
Software
simulated annealing
X-PLOR NIH
NMR Ensemble Information
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
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.