A

\ Antibody x binding site

Enkephalin binding site | ("S-receptor"),

\ Antibody x binding site

Enkephalin binding site | ("S-receptor"),

Morphine binding site

—~ = Random coil /v^ = ¡8-Sheet uu = a-Helix _ 0-Turn

Morphine binding site

—~ = Random coil /v^ = ¡8-Sheet uu = a-Helix _ 0-Turn

FIGURE 5-32 Potential receptor-binding sites for /3-endorphin. Reproduced with permission from Li, C. H. (1982). Beta endorphin. Cell 31, 504-505.

TABLE 5-4 Classification of Opioid Receptors and Their Actions"

Receptor

Ligand

Transducer

Molecular action

Physiological effects

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