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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Multinuclear Silver(I)-Selenium Clusters Formation in Selenopeptides.

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Ionic silver (Ag+) reacts more readily with selenopeptide analogues of arginine vasopressin (AVP) than cysteine-based AVP. This binding preference for selenocysteine (SeCys) over cysteine (Cys) reveals new insights into silver toxicity.

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Area of Science:

  • Biochemistry
  • Inorganic Chemistry
  • Computational Chemistry

Background:

  • Arginine vasopressin (AVP) is a nonapeptide hormone crucial in regulating water balance.
  • Cysteine residues in AVP form a cyclic structure via disulfide bonds.
  • The biological impact of ionic silver (Ag+) interactions with peptides is an emerging area of research.

Purpose of the Study:

  • To investigate the reaction mechanisms between Ag+ ions and AVP, including its diselenium analogue.
  • To compare the binding affinity and reactivity of Ag+ with cysteine versus selenocysteine residues in AVP.
  • To elucidate the structural and electronic properties of the resulting silver-peptide complexes.

Main Methods:

  • Liquid chromatography-mass spectrometry (LC-MS) for identifying reaction products.
  • UV-visible spectroscopy (UV-vis) for characterizing electronic transitions and complex formation.
  • Density Functional Theory (DFT) calculations for modeling structures and electronic properties.

Main Results:

  • The replacement of cysteine (Cys) with selenocysteine (SeCys) in AVP significantly increased peptide reactivity towards Ag+ under reducing conditions.
  • Formation of a tetrameric selenium-silver cluster (Se4Ag4) was observed, mediated by Ag(I)-induced dimerization of diselenide AVP.
  • Specific electronic absorption bands and DFT calculations confirmed the formation of an Ag4(peptide)2 complex, indicating a preference for SeCys binding sites.

Conclusions:

  • Ionic silver (Ag+) preferentially binds to selenocysteine (SeCys) residues over cysteine (Cys) in arginine vasopressin (AVP).
  • This study provides the first evidence of Ag(I) binding to selenopeptides, forming unique silver-selenium clusters.
  • The findings suggest a potential role for selenobiomolecules in the cellular toxicity of silver, opening new avenues for research.