Related Experiment Video
Updated: Dec 18, 2025

Operant Protocols for Assessing the Cost-benefit Analysis During Reinforced Decision Making by Rodents
Published on: September 10, 2018
Novel µ opioid antagonists derived from the µ opioid agonists endomorphin and [Dmt1 ]DALDA (H-Dmt-D-Arg-Phe-Lys-NH2 )
Saijian Shi1, Jian Xu1, LingLing Feng1
1School of Pharmacy, Nanjing Medical University, Nanjing, China.
Abstract:
Hybrid analogues of the µ opioid agonists endomorphin and [Dmt1 ]DALDA (H-Dmt-D-Arg-Phe-Lys-NH2 , Dmt = 2',6'-dimethyltyrosine) containing cis-4-amino-Pro, trans-4-amino-Pro, cis-4-aminoethyl-Pro or cis-4-guanidinylethyl-Pro in the 2 position of the peptide sequence were synthesized. None of the compounds retained high µ opioid agonist activity and, unexpectedly, substitution of cis-4-amino-Pro resulted in a novel class of potent µ opioid antagonists. In particular, the compound H-Dmt-cis-4-amino-Pro-Trp-Lys-NH2 (CZ-1) turned out to be a highly selective µ opioid antagonist with ~1 nM µ receptor binding affinity.
More Related Videos
09:09Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography
Published on: September 20, 2016
16:02Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation
Published on: February 10, 2023
Related Concept Videos
Opioid Receptors: Overview
Opioid Analgesics: Synthetic and Semisynthetic Opioids
Opioid Analgesics: Morphine and Other Natural Cogeners
Analgesia and Pain Management
Drug-Receptor Interaction: Agonist
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous...
Adrenergic Agonists: Chemistry and Structure-Activity Relationship
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...