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Related Concept Videos

Opioid Receptors: Overview01:22

Opioid Receptors: Overview

Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2, D-Pen5]-enkephalin or DPDPE for...
Analgesia and Pain Management01:25

Analgesia and Pain Management

Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
The Two-State Receptor Model01:29

The Two-State Receptor Model

The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with one...
Drug-Receptor Interactions01:29

Drug-Receptor Interactions

Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue.
Opioid Analgesics: Morphine and Other Natural Cogeners01:20

Opioid Analgesics: Morphine and Other Natural Cogeners

Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...
Drug-Receptor Interaction: Agonist01:25

Drug-Receptor Interaction: Agonist

Agonists are drugs that interact with specific receptors in the body to produce a biological response. When an agonist binds to a receptor, it activates or enhances the receptor's function, leading to physiological effects. The interaction between agonist drugs and receptors is crucial for their therapeutic action in various medical treatments.
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous ligand's action.

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Structural basis for μ-opioid receptor binding and activation.

Adrian W R Serohijos1, Shuangye Yin, Feng Ding

  • 1Biochemistry and Biophysics Department, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Structure (London, England : 1993)
|November 15, 2011
PubMed
Summary

Researchers developed a structural model for the micro-opioid receptor (MOR1), crucial for pain relief. This model aids in understanding how drugs interact with MOR1 and screens for new pain-relieving compounds.

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Area of Science:

  • Pharmacology and Structural Biology
  • Computational Chemistry and Molecular Modeling

Background:

  • Micro-opioid receptor (MOR1) agonists are primary analgesics.
  • Understanding MOR1 structure is key to developing effective pain treatments.

Purpose of the Study:

  • To create a structural model of MOR1.
  • To use the model for identifying potential analgesic compounds.

Main Methods:

  • Molecular dynamics simulations to analyze MOR1 flexibility and ligand interactions.
  • Site-directed mutagenesis, radioligand binding, and functional assays to validate binding sites.
  • Virtual screening of a large compound library using the MOR1 model.

Main Results:

  • Identified ligand-dependent conformational changes in MOR1's intracellular loop.
  • Validated key residues involved in ligand binding.
  • Successfully identified nalmefene, a known antagonist, through virtual screening, validating the model's predictive power.

Conclusions:

  • The developed MOR1 structural model is a valuable tool for understanding opioid receptor signaling.
  • The model can effectively screen for novel analgesic drug candidates.