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Related Experiment Videos

Dermorphin-based potential affinity labels for mu-opioid receptors.

H Choi1, T F Murray, J V Aldrich

  • 1Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, USA.

The Journal of Peptide Research : Official Journal of the American Peptide Society
|December 11, 2002
PubMed
Summary

Researchers modified amphibian-derived micro-opioid receptor ligands, dermorphin and [Lys7]dermorphin, with electrophilic groups. Modifications in the

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Area of Science:

  • * Biochemistry and Molecular Pharmacology
  • * Neuroscience and Drug Discovery

Background:

  • * Dermorphin and [Lys7]dermorphin are selective micro-opioid receptor ligands found in amphibian skin.
  • * These peptides are being explored as potential peptide-based affinity labels for micro-opioid receptors.

Purpose of the Study:

  • * To synthesize and evaluate modified dermorphin analogs as potential affinity labels for micro-opioid receptors.
  • * To investigate the impact of electrophilic modifications in the 'message' and 'address' domains on receptor binding affinity and selectivity.

Main Methods:

  • * Peptide synthesis involving incorporation of Fmoc-Phe(p-NHAlloc) for introducing electrophilic isothiocyanate and bromoacetamide groups.
  • * Radioligand binding assays using Chinese hamster ovary (CHO) cells expressing micro- and delta-opioid receptors.

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Main Results:

  • * Electrophilic modification in the 'message' domain significantly reduced binding affinity (>1000-fold), except for [Phe(p-NH2)3]dermorphin.
  • * Modifications in the 'address' region were better tolerated, with [Phe(p-NH2)5,Lys7]dermorphin showing similar affinity and higher selectivity for micro-opioid receptors.
  • * Bromoacetamide-modified peptides ([Phe(p-NHCOCH2Br)5]- and [Phe(p-NHCOCH2Br)5,Lys7]dermorphin) displayed high micro-opioid receptor affinity but lacked wash-resistant binding.

Conclusions:

  • * The 'address' region of dermorphin analogs is more amenable to modification for creating affinity labels.
  • * While high affinity was achieved, the lack of wash-resistant binding suggests these specific modifications may not be ideal for irreversible labeling.
  • * Further research could explore alternative modification strategies to develop effective peptide-based affinity labels for micro-opioid receptors.