Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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An NMR Study on the Conformation of Substance P in Acidic Bicelles

  • Baek, Seung-Bin (Department of Chemistry, Pohang University of Science and Technology) ;
  • Lim, Sung-Chul (Department of Chemistry, Pohang University of Science and Technology) ;
  • Lee, Hyeong-Ju (Department of Chemistry, Pohang University of Science and Technology) ;
  • Lee, Hee-Cheon (Department of Chemistry, Pohang University of Science and Technology) ;
  • Kim, Chul (Department of Chemistry, Hannam University)
  • Received : 2011.03.28
  • Accepted : 2011.08.22
  • Published : 2011.10.20
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Abstract

The conformation of a neuropeptide, substance P (SP), in isotropic (q = 0.5) acidic bicelles was investigated using two-dimensional NMR techniques. By the nuclear Overhauser effect (NOE) cross peaks between SP and long-chain lipid molecules SP was probed to bind on the flat surface of the disc-like bicelles. Structural analysis of NMR data indicated that the helical conformation of SP extended to the C-terminal region of Leu10 as well as in the mid-region from Pro4 to Phe8. As compared with the conformations of SP bound on the sodium dodecylsulfate (SDS) or the dodecylphosphocholine (DPC) micelles with curved surfaces, the surface curvature of the membrane mimics was found to be one of the major factors inducing the biologically relevant conformation of SP. The negative surface charge of the membrane is also a key factor inducing both the binding of SP on the membrane and its biologically active structure.

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