Multinuclear Silver(I)–Selenium Clusters Formation in SelenopeptidesClick to copy article linkArticle link copied!
- Tshering ZangmoTshering ZangmoUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Tshering Zangmo
- Paulina SzczerbaPaulina SzczerbaInstitute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, PolandMore by Paulina Szczerba
- Ioannis KanavosIoannis KanavosUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Ioannis Kanavos
- Alejandro Gutiérrez-QuintanillaAlejandro Gutiérrez-QuintanillaUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Alejandro Gutiérrez-Quintanilla
- Karinne MiqueuKarinne MiqueuUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Karinne Miqueu
- Joanna SzpunarJoanna SzpunarUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Joanna Szpunar
- Panaghiotis KaramanisPanaghiotis KaramanisUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Panaghiotis Karamanis
- Wojciech BalWojciech BalInstitute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, PolandMore by Wojciech Bal
- Luisa Ronga*Luisa Ronga*Email: [email protected]Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, 2 Avenue du Président Pierre Angot, Pau 64053, FranceMore by Luisa Ronga
Abstract

The reactions of ionic silver (Ag+) with arginine vasopressin (AVP), a nonapeptide hormone cyclized by two cysteine residues, and its diselenium analogue was explored by an integrated LC-MS, UV–vis, and DFT approach. The replacement of Cys by SeCys in AVP increased the reactivity of the peptide toward Ag+ ions under mildly reducing conditions, with the formation of a Se4Ag4 cluster provided by Ag(I)-mediated dimerization of diselenide AVP. Specific electronic absorption bands confirmed the formation of the Ag4peptide2 complex, supported by DFT calculations. These results provide the first ever evidence that Ag(I) ions bind a selenopeptide and prefer SeCys over Cys as binding sites, opening a perspective on the involvement of selenobiomolecules in the emerging cellular toxicity of silver.
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