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Solution structure of human neuropeptide Y

S A Monks1, G Karagianis, G J Howlett

  • 1Biomolecular Research Institute, Parkville, VIC, Australia.

Journal of Biomolecular NMR
|December 1, 1996
PubMed
Summary

Synthetic human neuropeptide Y forms dimers in solution. NMR structural analysis reveals an amphipathic alpha-helix in residues 13-36, supporting previous findings for porcine neuropeptide Y.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Neuropeptide Y (NPY) is a crucial neurotransmitter involved in various physiological processes.
  • Understanding the three-dimensional structure of human NPY is essential for elucidating its function and interactions.
  • Previous structural studies on human NPY have yielded conflicting models.

Purpose of the Study:

  • To determine the solution structure of synthetic human neuropeptide Y.
  • To investigate the aggregation behavior of human neuropeptide Y.

Main Methods:

  • Two-dimensional 1H Nuclear Magnetic Resonance (NMR) spectroscopy at 600 MHz.
  • Distance geometry calculations using DIANA and simulated annealing/restrained energy minimization in X-PLOR.
  • Sedimentation equilibrium experiments.

Main Results:

  • A well-defined structure for residues 11-36, characterized by an amphipathic alpha-helix.
  • The N-terminal 10 residues exhibit poor definition with evidence of cis/trans proline conformations.
  • Evidence for dimer formation with antiparallel helical packing, confirmed by sedimentation equilibrium.

Conclusions:

  • The determined structure supports features observed in porcine NPY, differing from a previously proposed 'aPP' fold for human NPY.
  • Human neuropeptide Y self-associates into dimers and higher aggregates under experimental conditions.
  • The study provides a refined structural model for human neuropeptide Y in solution.

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