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Title: Structure-activity relationship of hylambatin and its fragments as studied in the guinea-pig ileum. Author: Inoue A, Fukuyasu T, Nakata Y, Yajima H, Nomizu M, Inagaki Y, Asano K, Segawa T. Journal: J Pharm Pharmacol; 1988 Jan; 40(1):72-3. PubMed ID: 2896785. Abstract: Hylambatin (Hyl), a dodecapeptide isolated from the skin of the African frog, Hylambates maculatus, belongs to the family of tachykinin or physalaemin-like peptides. Hylambatin and its 12 fragments were tested in the guinea-pig ileum preparation for contractile activities. All fragments except 3 had contractile activities. The C-terminal fragment as short as the octapeptide sequence was at least as active as the parent molecules. The heptapeptide fragment (Hyl6-12) and the hexapeptide fragment (Hyl7-12) were less active and the C-terminal pentapeptide fragment (Hyl8-12) and the N-terminal hexapeptide fragment (Hyl1-6) were much less active. The N-terminal pentapeptide fragment (Hyl1-5) and the N-terminal fragment from which the N-terminal Asp or Asp-Pro residues were removed (Hyl2-6, Hyl3-6), were inactive at doses used.[Abstract] [Full Text] [Related] [New Search]