[D-Ala2]-deltorphin I peptoid and retropeptoid analogues: Synthesis, bilogical activity and conformational investigations
Department of Organic Chemistry, University of Padova, Institute of Biomolecular Chemistry, CNR, Section of Padova, via Marzolo, 1, 35131 Padova, Italy.Journal of Peptide Science (Impact Factor: 1.55). 09/2004; 10(9):578-87. DOI: 10.1002/psc.566
The synthesis is described of a [D-Ala2]-deltorphin I peptoid analogue in which all amino acid residues have been substituted by the corresponding N-alkylglycine residues. The [D-Ala2]-deltorphin I retropeptoid was also prepared as well as [Ala1 ,D-Ala2]-deltorphin 1 and the corresponding peptoid. Structural investigations by FT-IR and fluorescence measurements were carried out on the synthetic analogues and on some [D-Ala2]-deltorphin 1 peptide-peptoid hybrids previously prepared. According to the fluorescence measurements the distance between the aromatic residues in the deltorphin I peptoid and retropeptoid is similar to that suggested for the delta- and micro-opioids, respectively. Measurements of CD in the presence of beta-cyclodextrin, and some preliminary pharmacological experiments were also performed. No dichroic bands are present in the spectrum of the [Ntyr1,D-Ala2]-deltorphin I, but an increasing dichroic effect appears in the spectra of both the deltorphin I peptoid and retropeptoid. Activity tests on isolated organ preparations showed that the modifications made produced a dramatic decrease in the agonistic activity of the synthetic derivatives.
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