Abstract
The relative structural rigidity of enkephalin analogues characterized by the molar ellipticity data obtained from the circular dichroism spectra of peptides was correlated with the opioid agonist activities of compounds displayed in isolated, electrically stimulated longitudinal muscle strip of guinea-pig ileum and mouse vas deferens preparations. It was found that the so called μ receptors modelled by guinea-pig ileum preferred the analogues with high capacity to exist in folded form, whilst the so called δ receptors (mouse vas deferens) accepted flexible ligands as readily as rigid ones.
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