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Studies on the interaction between Ag(+) and DNA.

Zahed Hossain¹, Fazlul Huq

¹School of Biomedical Sciences, Faculty of Health Sciences, C42, University of Sydney, P.O. Box 170, Lindcombe, NSW 1825, Australia.

Journal of Inorganic Biochemistry

|August 6, 2002

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Silver ions bind to DNA, decreasing its mobility. Mixtures of silver ions and ascorbate cause significant DNA damage, likely via free radical formation catalyzed by the metal.

Area of Science:

Biochemistry
Molecular Biology
Toxicology

Background:

The interaction between metal ions and DNA is crucial for understanding DNA structure, function, and toxicity.
Silver ions are known to interact with biological molecules, but their specific effects on DNA structure and integrity require further elucidation.

Purpose of the Study:

To investigate the interaction between silver ions and DNA using biophysical methods.
To assess the DNA-damaging potential of silver ions alone and in combination with ascorbate.

Main Methods:

Submarine gel electrophoresis was employed to analyze the structural changes and integrity of plasmid and genomic DNA upon interaction with silver ions.
Various concentrations of silver(I) acetate and its mixtures with ascorbate were tested.

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Main Results:

Silver(I) acetate binding to pBR322 plasmid DNA reduced band mobility, indicating increased covalent binding, without altering band intensity.
Mixtures of silver(I) acetate and ascorbate exhibited significantly greater DNA damage to both plasmid and genomic DNA compared to either agent alone.
A specific concentration (12.5 mM) of the silver-ascorbate mixture showed maximal DNA damage to pBR322 plasmid DNA.

Conclusions:

Silver ions covalently bind to DNA, affecting its electrophoretic mobility.
The combination of silver ions and ascorbate synergistically enhances DNA damage, likely mediated by ascorbate oxidation-derived free radicals with silver acting as a catalyst.
This study highlights the potential genotoxicity of silver-ascorbate mixtures, relevant for applications involving silver compounds and biological systems.