Ashkin-Teller formalism for elastic response of DNA molecule to external force and torque

Details Ashkin-Teller formalism for elastic response of DNA molecule to external force and torque Ashkin-Teller formalism for elastic response of DNA molecule to external force and torque

2008-01-11

arxiv.org/abs/0801.1705v1

Physics

Biological Physics

5 pages, 7 figures

Scientific paper

We propose an Ashkin-Teller like model for elastic response of DNA molecule to external force and torque. The base-stacking interaction is described in a simple and uniform way. We obtain the phase diagram of dsDNA, and in particular, the transition from B form to the S state induced by stretching and twisting. The elastic response of the ssDNA is presented also in a unified formalism. The close relation of dsDNA molecule structure with elastic response is shown clearly. The calculated folding angle of the dsDNA molecule is $59.2^o$.

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