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.1989 Sep 25;255(2):269-74.
doi: 10.1016/0014-5793(89)81104-4.

Isolation of dermenkephalin from amphibian skin, a high-affinity delta-selective opioid heptapeptide containing a D-amino acid residue

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Isolation of dermenkephalin from amphibian skin, a high-affinity delta-selective opioid heptapeptide containing a D-amino acid residue

A Mor et al. FEBS Lett..
Free article

Abstract

The predicted amino acid sequence of the biosynthetic precursor of dermorphin, a highly potent and nearly specific mu-opioid peptide from amphibian skin, contains four repeats of the dermorphin progenitor sequence and one single copy of a different heptapeptide sequence. We have developed a specific enzyme immunoassay and used synthetic peptides to detect and purify the new predicted heptapeptide (2.4 micrograms/g dry skin) from the skin of the Phyllomedusa sauvagei frog from which dermorphin was originally isolated. The identity of the novel pro-dermorphin related peptide, Tyr-D-Met-Phe-His-Leu-Met-Asp-NH2, was established by co-chromatography with synthetic peptides on reverse-phase HPLC, immunological analysis, gas-phase sequencing, mass spectrometry and by pharmacological assays. Opioid-binding assays in vitro demonstrated that both the natural and synthetic heptapeptides displayed exceptionally high selectivity and affinity towards the delta-opioid receptors. Because of its origin and its delta-opioid (enkephalin) activity and specificity, this novel D-amino acid containing peptide is named dermenkephalin.

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