Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 12, 2010
Previous Article Next Article

Electron donor–acceptor properties of metal atoms interacting with pterins

Author affiliations

Abstract

Many animal colorants have been described as scavengers of free radicals. Pterins, also known as pteridines, represent one of these pigments. These molecules are analogous to guanine and consist of heterocyclic compounds, which have the highest nitrogen content of any colorant analyzed from animals. One of the mechanisms used for scavenging free radicals is that of the electron transfer reaction, which can be analyzed in terms of the electron donor–acceptor properties of these molecules. The interaction of metal atoms with pterins modifies the properties of pterins, in such a way that they manifest altered electron transfer properties. In this paper, Density Functional Approximation calculations are used to analyze the interaction of pterins (pterin, isoxanthopterin and sepiapterin) with metal atoms (M = Cu, Ag, Au, Zn, Cd or Hg). Neutral (in gas phase), cations and di-cations (in water) are analyzed in order to assess the effect of the positive charge in the M–pterin interaction. Evidently, there is a correlation between the dissociation energy involved in the removal of the metal atom and the ionization energy of the metal atom. Those pterins containing certain cationic metals (such as Zn, Cd and Hg) are depicted as better antioxidants than other pterins, and likewise the interaction with Cu, Ag and Au (di-cations) produces compounds that may act as electron acceptors. The electron transfer reaction between metal–pterins and HO˙ is exergonic only when pterins are bonded to Zn, Cd and Hg (cations). This new information may contribute to elucidate the way pterins participate in oxidative stress. Besides this, these results may inspire new experiments similar to those reported previously for the reaction of guanine with metal atoms.

Graphical abstract: Electron donor–acceptor properties of metal atoms interacting with pterins

Back to tab navigation

Supplementary files

Article information


Submitted
31 Dec 2009
Accepted
25 Aug 2010
First published
27 Sep 2010

New J. Chem., 2010,34, 2988-2995
Article type
Paper

Electron donor–acceptor properties of metal atoms interacting with pterins

A. Martínez and R. Vargas, New J. Chem., 2010, 34, 2988
DOI: 10.1039/B9NJ00805E

Social activity

Search articles by author

Spotlight

Advertisements