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- W2025716627 abstract "Structural features influencing binding activity of dermorphin to opioid receptors have been investigated in the rat brain through the synthesis and evaluation of binding affinity of a series of synthetic dermorphin analogs. Tritiated dermorphin was used as primary ligand. The single population of high affinity dermorphin binding sites present in the rat brain is clearly of an opioid nature since bound radiolabeled dermorphin was fully displaced with high affinity either by morphine or naloxone. Displacement of tritiated dermorphin by all alkaloid opiates or dermorphin related peptides tested was monophasic, consistent with simple competitive inhibition at a single population of binding sites. Dermorphin (Tyr-D-Ala-Phe-Gly-Tyr-Pro-Ser-NH2) was the most potent competitor in all experiments. The D-configuration of the amino acid residue in position 2 was found to be of crucial importance for binding. Replacement of D-Ala2 with L-Ala led to a deleterious effect, this analog being 1/5000th as potent as dermorphin in displacing bound tritiated dermorphin from its receptor. Shorter dermorphin homologs, dermorphin-(1-4)-NH2 and dermorphin-(1-3)-NH2, were found to be 20 and 40-fold less potent, respectively, than dermorphin. The C-terminal carboxamide function is of significant importance for manifestation of the full intrinsic binding potency of dermorphin. Deamidated dermorphin had 1/5th the potency of the parent peptide. This suggests that while the whole dermorphin sequence is required for the expression of the full intrinsic binding activity of the molecule, the N-terminal tripeptide is a key structure as it contains the features which allow receptor recognition." @default.
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- W2025716627 date "2009-01-12" @default.
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- W2025716627 title "Structural requirements for dermorphin opioid receptor binding" @default.
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- W2025716627 doi "https://doi.org/10.1111/j.1399-3011.1988.tb00922.x" @default.
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