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NMR structure of Methionine-Enkephalin in fast tumbling DMPC/DHPC bicelles
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
5.4uM Menk; DMPC/DHPC: 0.5:1 (molar ratio); Lipid/peptide: 25:1 (molar ratio); 10% w/v of lipids in water; 90%H2O, 10%D2O
90% H2O/10% D2O
9mM
4.5
ambient
295
2
g-COSY
5.4uM Menk; DMPC/DHPC: 0.5:1 (molar ratio); Lipid/peptide: 25:1 (molar ratio); 10% w/v of lipids in water; 90%H2O, 10%D2O
90% H2O/10% D2O
9mM
4.5
ambient
295
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
INOVA
600
NMR Refinement
Method
Details
Software
simulated annealing
The structures are based on a total of 2 phi angle and 57 NOE-derived distance constraints.
1000 high-temperature steps were used (15 ps) up to a final temperature of 50000 K then 1000 cooling steps (250 K, 15 ps) were applied.
Finally, 10 cycles of 200 minimization steps were performed.
A repel constant value of 0.8 was used
VNMR
NMR Ensemble Information
Conformer Selection Criteria
structures with the lowest energy
Conformers Calculated Total Number
200
Conformers Submitted Total Number
80
Representative Model
1 (1 to 4, closest to the average of each of the four conformers)