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• W2046130512 abstract "Cystine disulfide bond is a common feature in numerous biologically active peptides and proteins and accordingly its replacement by various surrogates presents a potential route to obtain analogs with improved pharmacokinetic characteristics. The purpose of the present study was to assess whether an azo-bridge can serve as such a surrogate. In view of the marked clinical significance of somatostatin and the brain natriuretic peptide (BNP) we choose these peptides as a model. Three cyclic-azo somatostatin analogs and three cyclic-azo BNP analogs were effectively prepared in solution through azo bond formation between p-amino phenylalanine and His or Tyr residues that were positioned in the peptide sequences in place of the native Cys residues. The peptides binding affinities to the sst2 and ANP-receptor (NPR-A) expressed on rat acinar pancreating carcinoma AR4-2J cell membranes and HeLa cells, respectively, were examined. The somatostatin analogs displayed good to moderate affinities to the rat sst2 in the nM range with best results obtained with peptide 2, that is, IC50 = 8.1 nM. Molecular dynamics simulations on these peptides suggests on a correlation between the observed binding potencies and the degree of conformational space overlapping with that of somatostatin. The BNP analogs exhibited binding affinities to the NPR-A in the nM range with best results obtained with BNP-1, that is, IC50 = 60 nM." @default.
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• W2046130512 date "2011-01-01" @default.
• W2046130512 modified "2023-10-01" @default.
• W2046130512 title "Intramolecular azo-bridge as a cystine disulfide bond surrogate: Somatostatin-14 and brain natriuretic peptide (BNP) analogs" @default.
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• W2046130512 doi "https://doi.org/10.1016/j.bmc.2010.12.014" @default.
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