| Examination of the role of the amphipathic alpha-helix in the interaction of neuropeptide Y and active cyclic analogues with cell membrane receptors and dimyristoylphosphatidylcholine. | |
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MedLine Citation:
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PMID: 2158344 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To test the potential importance of the putative C-terminal amphipathic alpha-helical region of neuropeptide Y (NPY) in receptor binding, the interactions of porcine NPY and several peptide analogues with lipid and cell membrane receptors were compared. Cyclic analogues were designed to constrain the N- and C-terminal regions of the peptide and to retain the folded conformation of NPY predicted from its sequence analogy with pancreatic polypeptide and its similar spectral behavior. The three cyclic peptides were [Cys2, 8-aminooctanoic acid5-24, D-Cys27]-NPY (C2-NPY), [Cys5, 8-aminooctanoic acid7-20, D-Cys24]-NPY (C5-NPY), and [D-Cys7, 8-aminooctanoic acid8-17, Cys20]-NPY (C7-NPY). All of the peptides bind with high affinity to pig spleen membranes, but only NPY and [Glu16, Ser18, Ala22, Leu28,31]-NPY (ESALL-NPY) bind quantitatively to dimyristoylphosphatidylcholine (DMPC) liposomes. C7-NPY and NPY20-36 bind with moderate affinity to liposomes, but only NPY and C7-NPY bind with high affinity to mouse brain receptors. Thus, lipid binding and receptor binding are not correlated in this series of peptides, and binding to the pig spleen receptor appears to require only the C-terminal region of the peptide. Simple lipid binding, as in NPY20-36, is insufficient for binding to the mouse brain receptor, suggesting that the N-terminal region of the peptide is required for high-affinity binding to this receptor. Data from fluorescence, differential scanning calorimetry, and liposome clearing experiments suggest that, although the interaction of NPY with lipid is consistent with formation of an amphipathic alpha-helix, a simple amphipathic alpha-helical model for the interaction with the high-affinity NPY receptor is insufficient to explain the data.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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L R McLean; S H Buck; J L Krstenansky |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Biochemistry Volume: 29 ISSN: 0006-2960 ISO Abbreviation: Biochemistry Publication Date: 1990 Feb |
Date Detail:
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Created Date: 1990-05-29 Completed Date: 1990-05-29 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370623 Medline TA: Biochemistry Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2016-22 Citation Subset: IM |
Affiliation:
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Merrell Dow Research Institute, Cincinnati, Ohio 45215. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acid Sequence Animals Brain / metabolism Calorimetry, Differential Scanning Cell Membrane Dimyristoylphosphatidylcholine / metabolism* Liposomes / metabolism Mice Molecular Sequence Data Neuropeptide Y / analogs & derivatives, metabolism* Protein Conformation Receptors, Cell Surface / metabolism* Spleen / metabolism Swine |
| Chemical | |
Reg. No./Substance:
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0/Liposomes; 0/Neuropeptide Y; 0/Receptors, Cell Surface; 13699-48-4/Dimyristoylphosphatidylcholine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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