Abstract
Terahertz-frequency phonon-like modes in DNA have been widely studied both experimentally and theoretically in recent years. However, current theoretical models turn out to fail to reproduce some basic properties of these modes. Using a generalized hydrodynamics approach and the results of inelastic X-ray scattering measurements, we propose a model to describe structural effects due to wavenumber dependence of the static structure factor in the dynamics of longitudinal acoustic-like excitations in DNA. Our analysis qualitatively suggests that on a length scale corresponding to a wavenumber region between the positions of the maximum and the minimum of the dispersion relation for the excitation frequency, structural effects may induce a tendency of delocalization of the dynamics. This proposal is consistent with the recent experimental observations of delocalized terahertz-frequency DNA phonon-like modes that seem to be relevant to biological function.
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Acknowledgments
We are grateful to the referees for their critical comments and suggestions and to O.S. Volodko for help in numerical simulations.
Funding
This was supported by Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Regional Fund of Science (project no. 19-41-240003 “Mathematical Modeling of Collective Atomic Dynamics of Biomacromolecules in Non-Equilibrium Conditions on a Picosecond Time Scale”).
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Zakhvataev, V.E., Kompaniets, L.A. Delocalization of Longitudinal Acoustic-Like Excitations in DNA Due to Structural Effects. Jetp Lett. 112, 444–451 (2020). https://doi.org/10.1134/S0021364020190030
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DOI: https://doi.org/10.1134/S0021364020190030