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Dansylated analogues of the potent and selective micro opioid peptide agonist [Dmt(1)]DALDA (H-Dmt-D-Arg-Phe-Lys-NH(2); Dmt = 2',6'-dimethyltyrosine) were prepared either by substitution of N(beta)-dansyl-alpha,beta-diaminopropionic acid or N(epsilon)-dansyllysine for Lys(4), or by attachment of a dansyl group to the C-terminal carboxamide function via a linker. All three analogues displayed high micro agonist potency in vitro and the C-terminally dansylated one retained significant micro receptor selectivity. The three analogues showed interesting differences in their fluorescence emission maxima and quantum yields, indicating that the dansyl group in two of them was engaged in intramolecular hydrophobic interactions. These dansylated [Dmt(1)]DALDA analogues represent valuable tools for binding studies, cellular uptake and intracellular distribution studies, and tissue distribution studies.

Dansylated analogues of the opioid peptide [Dmt1]DALDA: in vitro activity profiles and fluorescence parameters.