NMR structure of Methionine-Enkephalin in fast tumbling Bicelles/DMPG

SOLUTION NMR Experimental Data

Experimental Details
Sample Conditions
Sample Contents5.1uM Menk; (DMPC+DMPG)/DHPC: 0.5:1 (molar ratio); DMPC/DMPG: 9:1 (molar ratio); Lipid/peptide: 25:1 (molar ratio); 10% w/v of lipids in water; 90%H2O, 10%D2O
Solvent90% H2O/10% D2O
Ionic Strength9mM
Temperature (K)295
Experiment(s):2D NOESY, g-COSY
Spectrometer Information
Manufacturer Model Field Strength
Varian INOVA 600.0
NMR Refinement
Method simulated annealing
Details The structures are based on a total of 2 phi angle and 58 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
NMR Ensemble Information
Conformer Selection Criteria structures with the lowest energy
Conformers Calculated Total Number 200
Conformers Submitted Total Number 80
Representative Model Choice Rationale
1 1 and 2, closest to the average of each of the two conformers
Additional NMR Experimental Information
1 PFG diffusion experiments were also performed on the sample
Computation: NMR Software
# Classification Software Name Author
1 collection version: 6.1C VNMR Varian Inc.
2 processing version: 2.0 Rev 2001.117.12.48 NMRPipe Frank Delaglio
3 data analysis version: 5.0.4 NMRView Bruce A. Johnson
4 structure solution version: 1.1 CNS Axel T. Brunger
5 refinement version: 1.1 CNS Axel T. Brunger