A Frog Peptide Achieved Extreme Delta-Opioid Selectivity Through Its Tail End
The C-terminal residues Met6 and Asp7 of dermenkephalin are the key to its exceptional delta-receptor selectivity — overriding the mu-preference of its N-terminal opioid core.
Quick Facts
What This Study Found
The C-terminal residues Met6 and Asp7 of dermenkephalin are the primary determinants of delta-opioid receptor selectivity, overriding the mu-preferring N-terminal domain.
Key Numbers
How They Did This
Structure-activity analysis using synthetic analogs, deletions, and hybrid peptides. Binding affinity at mu and delta sites was measured in brain membrane preparations.
Why This Research Matters
This work identified the molecular rules for making peptides selective for delta-opioid receptors. Delta receptors may produce pain relief with fewer side effects than mu receptors.
The Bigger Picture
Modular peptide design — where an active core is tuned by accessory residues — is a powerful strategy for drug development. This natural example guides rational design of receptor-selective therapeutics.
What This Study Doesn't Tell Us
In-vitro binding study. Receptor selectivity in binding assays may not perfectly predict selectivity in functional or in-vivo settings.
Questions This Raises
- ?Can the selectivity-determining tail be grafted onto other opioid peptides?
- ?Could similar modular design apply to non-opioid peptide drugs?
Trust & Context
- Key Stat:
- Two residues determine selectivity Met6 and Asp7 override the mu-preferring opioid core to achieve delta selectivity
- Evidence Grade:
- Preliminary in-vitro study with systematic structure-activity analysis — excellent mechanistic insight.
- Study Age:
- Published in 1989 — elucidated the molecular basis of natural receptor selectivity.
- Original Title:
- Molecular determinants of receptor affinity and selectivity of the natural delta-opioid agonist, dermenkephalin.
- Published In:
- The Journal of biological chemistry, 264(29), 17100-6 (1989)
- Authors:
- Sagan, S, Amiche, M, Delfour, A, Mor, A, Camus, A, Nicolas, P
- Database ID:
- RPEP-00132
Evidence Hierarchy
Frequently Asked Questions
What is receptor selectivity?
The ability of a molecule to activate one type of receptor while ignoring others. High selectivity reduces side effects because only the intended target is activated.
Why is delta-selectivity useful?
Delta-opioid receptors mediate pain relief, mood improvement, and neuroprotection with potentially fewer addiction and respiratory depression risks than mu-opioid drugs.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00132APA
Sagan, S; Amiche, M; Delfour, A; Mor, A; Camus, A; Nicolas, P. (1989). Molecular determinants of receptor affinity and selectivity of the natural delta-opioid agonist, dermenkephalin.. The Journal of biological chemistry, 264(29), 17100-6.
MLA
Sagan, S, et al. "Molecular determinants of receptor affinity and selectivity of the natural delta-opioid agonist, dermenkephalin.." The Journal of biological chemistry, 1989.
RethinkPeptides
RethinkPeptides Research Database. "Molecular determinants of receptor affinity and selectivity ..." RPEP-00132. Retrieved from https://rethinkpeptides.com/research/sagan-1989-molecular-determinants-of-receptor
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.