Nonlinear Mechanical Response of DNA due to Anisotropic Bending Elasticity

Details Nonlinear Mechanical Response of DNA due to Anisotropic Bending Elasticity Nonlinear Mechanical Response of DNA due to Anisotropic Bending Elasticity

2002-07-19

arxiv.org/abs/cond-mat/0207477v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 encapsulated EPS figures

Scientific paper

The response of a short DNA segment to bending is studied, taking into account the anisotropy in the bending rigidities caused by the double-helical structure. It is shown that the anisotropy introduces an effective nonlinear twist-bend coupling that can lead to the formation of kinks and modulations in the curvature and/or in the twist, depending on the values of the elastic constants and the imposed deflection angle. The typical wavelength for the modulations, or the distance between the neighboring kinks is found to be set by half of the DNA pitch.

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