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The NMR-derived conformation of neuropeptide AF, an orphan G-protein coupled receptor peptide.

Abstract
The tertiary structure of the pain modulating and anti-opiate neuropeptide, human neuropeptide AF (NPAF) (the sequence is AGEGLNSQFWSLAAPQRF-NH(2)), was determined by (1)H-NMR. The structure of NPAF was determined in two solvent systems, namely 50%/50% trifluoroethanol-d(3)/H(2)O (TFE/H(2)O) and in the cell membrane mimetic micelle, sodium dodecylsulfate-d(25) (SDS). The receptor for NPAF is an orphan G-protein coupled receptor, and the micellar SDS solvent system was used to emulate the cell membrane surface in line with the Cell Membrane Compartments Theory proposed by R. Schwyzer (Biopolymers, 1995, Vol. 37, pp. 5-16). In both solvent systems, NPAF was found to be primarily alpha-helical within the central portion of the molecule, from Asn(6) to Ala(14). The N-terminus was random in both solvent systems. In the SDS solution, the C-terminal tetrapeptide was structured and formed a type I beta-turn, whereas in TFE/H(2)O it was unstructured, showing the importance of the C-terminal tetrapeptide in receptor recognition. NPAF was found to associate with SDS, and was shown to be near the surface of the micelle by spin label studies with 5-doxyl-stearic acid.
AuthorsMark Miskolzie, George Kotovych
JournalBiopolymers (Biopolymers) Vol. 69 Issue 2 Pg. 201-15 (Jun 2003) ISSN: 0006-3525 [Print] United States
PMID12767123 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright 2003 Wiley Periodicals, Inc.
Chemical References
  • Oligopeptides
  • Receptors, Neuropeptide
  • Solutions
  • Solvents
  • Spin Labels
  • Water
  • Sodium Dodecyl Sulfate
  • Trifluoroethanol
  • A18Famide
Topics
  • Amino Acid Sequence
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Nuclear Magnetic Resonance, Biomolecular (methods)
  • Oligopeptides (chemistry)
  • Protein Conformation
  • Receptors, Neuropeptide (genetics, metabolism)
  • Sodium Dodecyl Sulfate (chemistry)
  • Solutions
  • Solvents
  • Spin Labels
  • Trifluoroethanol (chemistry)
  • Water (chemistry)

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