Opioid Receptors

Cell membrane proteins that bind opioids and trigger intracellular changes which influence the behavior of cells. The endogenous ligands for opioid receptors in mammals include three families of peptides, the enkephalins, endorphins, and dynorphins. The receptor classes include mu, delta, and kappa receptors. Sigma receptors bind several psychoactive substances, including certain opioids, but their endogenous ligands are not known.

Also Known As:

Opioid Receptor; Opiate Receptor; Receptors, Opioid; Endorphin Receptor; Enkephalin Receptor; Normorphine Receptors; Opiate Receptors; Receptors, Normorphine; Receptors, beta-Endorphin; beta-Endorphin Receptor; Receptor, Endorphin; Receptor, Enkephalin; Receptor, Opiate; Receptor, Opioid; Receptor, beta-Endorphin; Receptors, beta Endorphin; beta Endorphin Receptor; beta-Endorphin Receptors; Endorphin Receptors; Enkephalin Receptors; Narcotic Receptors; Receptors, Endorphin; Receptors, Enkephalin; Receptors, Narcotic; Receptors, Opiate

Amino Acids, Peptides, and Proteins: 1
- Proteins: 484843
  - Membrane Proteins: 10078
    - Cell Surface Receptors: 2125
      - G-Protein-Coupled Receptors: 4701
        Opioid Receptors: 3718
      - Peptide Receptors: 1159
        Neuropeptide Receptors: 97
        Opioid Receptors: 3718
      - Neurotransmitter Receptors: 562
        Neuropeptide Receptors: 97
        Opioid Receptors: 3718

human OPRK1 protein

Bio-Agent Context: Research Results