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- W2022185257 abstract "Human urotensin II (hU-II; H-Glu-Thr-Pro-Asp-cyclo[Cys-Phe-Trp-Lys-Tyr-Cys]-Val-OH) is a disulfide bridged undecapeptide recently identified as the ligand of an orphan G protein-coupled receptor. hU-II has been described as the most potent vasoconstrictor compound identified to date. With the aim of replacing the disulfide bridge by a chemically more stable moiety, we have synthesized and tested a series of lactam analogues of hU-II minimum active fragment, that is hU-II(4-11). The contractile activity of the synthetic analogues on the rat isolated thoracic aorta was found to be dependent upon the dimension of the lactam bridge. The most active peptide, H-Asp-cyclo[Orn-Phe-Trp-Lys-Tyr-Asp]-Val-OH (3), is approximately 2 logs less potent than hU-II (pD(2)=6.3 vs 8.4). A conformational analysis in solution of the active peptide 3, one of the inactive analogues, and hU-II was performed, using NMR and molecular modelling techniques. A superposition of the calculated structures of hU-II and 3 clearly shows that three out of four key residues (i.e., Phe(6), Lys(8) and Tyr(9)) maintain the same side- chain orientation, while the fourth one, Trp(7), cannot be superimposed. This observation could explain the reduced biological activity of the synthetic analogue." @default.
- W2022185257 created "2016-06-24" @default.
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- W2022185257 date "2002-12-01" @default.
- W2022185257 modified "2023-10-05" @default.
- W2022185257 title "Design, Synthesis, Conformational Analysis, and Biological Studies of Urotensin-II Lactam Analogues" @default.
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- W2022185257 doi "https://doi.org/10.1016/s0968-0896(02)00372-3" @default.
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