Opioid receptors interact with G proteins and arrestin. In consequence, opioid receptors interact with protein biomolecules.
<h3>Proteins and opioid receptors</h3>
Proteins are fundamental biomolecules composed of long chains of building blocks called amino acids linked by peptide bonds.
Proteins may have both structural (e.g., components of the cytoskeleton) and enzymatic functions (in this case, activation of signaling pathways).
Opioid receptors interact outside the cell membrane with opioid drugs (e.g., heroin) and with the G proteins inside the cell.
Opioid receptors also interact inside the cell with a special protein that is known as arrestin, thereby activating specific signaling pathways.
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