Helical ordering of hydrogen bonds between pairs of DNA bases |
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Authors: | V L Golo Yu M Evdokimov S G Skuridin E I Kats |
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Institution: | (1) M. V. Lomonosov Moscow State University, 119899 Moscow, Russia;(2) Institute of Molecular Biology, Russian Academy of Sciences, 117984 Moscow, Russia;(3) L. D. Landau Institute of Theoretical Physics, Russian Academy of Sciences, 117940 Moscow, Russia |
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Abstract: | The interaction between hydrogen bonds and conformational elastic degrees of freedom has been investigated using the simplest
model of a double-strand DNA molecule. The hydrogen bonds are described in terms of two-level quantum systems. After excluding
conformational degrees of freedom, one has effective interaction among two-level systems. In the ground state of an ideal
double helix, hydrogen bonds in a DNA molecule also have a helical order induced by conformational degrees of freedom. The
pitch of the hydrogen-bond helix (and even its sign under certain conditions) is different from that of the basic helix pitch
and, generally speaking, is incommensurate with the latter. This effect can, possibly, lead to an inversion of the sign of
the circular dichroism in spectral bands, which was detected in some experiments.
Zh. éksp. Teor. Fiz. 115, 940–950 (March 1999) |
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