Influence of degradation on binding properties and biological activity of endomorphin 1

Ildikó Szatmári, Dauren Biyashev, Csaba Tömböly, Géza Tóth, Mónika Mácsai, Gyula Szabó, Anna Borsodi, Imre Lengyel*

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Citations (Scopus)


The recently-isolated endogenous peptide endomorphin 1 has high affinity for the μ opioid receptor and plays an important role in analgesia. Several of its degradation products have been isolated from the central nervous system. Degradation products present structural similarities and may influence the receptor binding properties and biological activity of the parent compound. Therefore, we investigated how degradation of endomorphin 1 might influence ligand binding to the μ opioid receptor, the consequent activation of G proteins and its antinociceptive effect. Both N- and C-terminal truncation of endomorphin 1 resulted in peptides presenting considerably lower opioid receptor binding potency. None of these peptides had an effect on GTP binding, nor was able to produce analgesia, suggesting that degradation destroys the biological activity of endomorphin 1.

Original languageEnglish
Pages (from-to)771-776
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - 2001
Externally publishedYes


  • Analgesia
  • Antinociception
  • Degradation
  • Endomorphin 1
  • G-protein
  • Mu opioid receptor

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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