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Biochimie. 2012 Dec;94(12):2508-13. doi: 10.1016/j.biochi.2012.06.029. Epub 2012 Jul 4.

A novel frog skin peptide containing function to induce muscle relaxation.

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Life Sciences College of Nanjing Agricultural University, 1st Weigang, Nanjing 210095, Jiangsu, China.


A novel bioactive peptide (polypedarelaxin 1) was identified from the skin secretions of the tree frog, Polypedates pingbianensis. Polypedarelaxin 1 is composed of 21 amino acid residues with a sequence of QGGLLGKVSNLANDALGILPI. Its primary structure was further confirmed by cDNA cloning and mass spectrometry analysis. Polypedarelaxin 1 was found to elicit concentration-dependent relaxation effects on isolated rat ileum. It has no antimicrobial and serine protease inhibitory activities. BLAST search revealed that polypedarelaxin 1 did not show similarity to known proteins or peptides. Especially, polypedarelaxin 1 do not contain conserved structural motifs of other amphibian myotropic peptides, such as bradykinins, bombesins, cholecystokinin (CCK), and tachykinins, indicating that polypedarelaxin 1 belongs to a novel family of amphibian myotropic peptide.

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