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Four different bombesins (bombesin, His 6 -bombesin, Phe 13 -bombesin and Asp 2 -, Phe 4 -SAP-bombesin) have been identified by a systematic sequencing study of peptides in reverse phase HPLC fractions of the skin secretion of the European yellow-bellied toad, Bombina variegata, that had been solvated in 0.1% (v/v) aqueous trifluoroacetic acid (TFA) and stored frozen...
Here we describe the structural and functional characterization of a novel myotropic peptide, sauvatide, from the skin secretion of the waxy monkey frog, Phyllomedusa sauvagei. Sauvatide is a C-terminally amidated decapeptide with the following primary structure – LRPAILVRTKamide – monoisotopic mass 1164.77Da, which was found to contract the smooth muscle of rat urinary bladder with an EC 50 ...
Tachykinins are among the most widely-studied families of regulatory peptides characterized by a highly-conserved C-terminal -Phe-X-Gly-Leu-Met.amide motif, which also constitutes the essential bioactive core. The amphibian skin has proved to be a rich source of these peptides with physalaemin from the skin of Physalaemus fuscomaculatus representing the archetypal aromatic tachykinin (X=Tyr or Phe)...
Bradykinin-related peptides (BRPs) represent one of the most widespread and closely studied families of amphibian defensive skin secretion peptides. Apart from canonical bradykinin (RPPGFSPFR) that was first reported in skin extracts of the European brown frog, Rana temporaria, many additional site-substituted, N- and/or C-terminally extended peptides have been isolated from skin extracts and secretions...
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