329013-01-6Relevant academic research and scientific papers
Synthesis and binding activity of endomorphin-1 analogues β-amino acids
Cardillo, Giuliana,Gentilucci, Luca,Melchiorre, Paolo,Spampinato, Santi
, p. 2755 - 2758 (2007/10/03)
Endomorphin-1 (Tyr-Pro-Trp-PheNH2) has been proposed as the most potent endogenous ligand of the μ-opioid receptors. In this paper, we describe the synthesis of some endomorphin-1 based tetrapeptides in which a residue of the sequence Tyr-Pro-Trp-PheNH2 is replaced by the corresponding β-isomer. These novel peptides showed different affinities for the opioid receptors labeled with [3H]-DAMGO in rat brain membranes, depending on the β-amino acid. In particular, the tetrapeptide containing β-Pro (Tyr-β-(R)-Pro-Trp-PheNH2) displayed a higher affinity than endogenous endomorphin-1, as revealed by their K(i) values (0.33 and 11.1 nM, respectively). (C) 2000 Elsevier Science Ltd.
