The Possibility of Blocking the Process of DNA Base Pairs Opening by Hydrogen Peroxide
One of the most progressive methods of cancer treatment is the ion beam therapy. Simulations of the water radiolysis show that the most long-living species in the cell medium are hydrogen peroxide (H2O2) molecules. But up to the present time, the role of H2O2 molecules in the deactivation of cancer cells has not been determined yet. To understand the possible role of H2O2 in the ion beam therapy, the competitive interaction of H2O and H2O2 molecules with nucleic bases in a pair on the different stages of genetic information transfer is studied in the present work. The method of atom-atomic potential functions is used in the calculations. It is shown that some configurations of A·T, and G·C complementary pairs are stabilized much
better by an H2O2 molecule as compared to a water molecule. The formation of such interaction complexes can terminate the processes of DNA unzipping by enzymes and consequently block the genetic information transfer processes in cancer cells during the ion beam treatment. An experimental method of verification of the interaction of hydrogen peroxide with nucleic base pairs is proposed.
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