Ion-phosphate vibrations in B- and A-forms of  DNA

S.N. Perepelytsya Taras Shevchenko Kyiv National University, Department of Physics
S.N. Volkov Bogolyubov Institute for Theoretical Physics, NASU

Keywords: DNA, ions, low-frequency spectra, vibrations, frequency, amplitude

Abstract

A model of the vibrational dynamics of DNA with counterions, which neutralize the phosphate groups of the double helix has been elaborated. For B- and A-DNA the parameters of the model, which describe the ion-phosphate vibrations have been determined. The frequencies of the DNA conformational vibrations have been calculated for Li⁺, Na⁺, K⁺, Rb⁺ and Cs⁺ metal ions. It has been shown that the frequency of ion-phosphate vibrations is located within 90 - 250 cm^-1 and it depends on the counterion type. The frequency of ion-phosphate vibrations is higher in the A-form of double helix than in B-form. It was found that the results of theoretical calculations are in agreement with the experimental data.

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Author Biographies

S.N. Perepelytsya, Taras Shevchenko Kyiv National University, Department of Physics

64 Volodymyrska Str., Kiev, 01033, Ukraine

S.N. Volkov, Bogolyubov Institute for Theoretical Physics, NASU

14-B Metrologichna Str., Kiev, 03143, Ukraine

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