Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1999-01-28
Phys. Rev. Lett. 82, 6560-6563 (1999) APS copyright.
Physics
Condensed Matter
Soft Condensed Matter
4 pages in Latex format, with 3 EPS figures included. A typographic mistake in Eq. (7) is corrected in this version. A slightl
Scientific paper
A unified model is constructed to study the recently observed DNA entropic elasticity, cooperative extensibility, and supercoiling property. With the introduction of a new structural parameter (the folding angle $\phi$), bending deformations of sugar-phosphate backbones, steric effects of nucleotide basepairs, and short-range basestacking interactions are considered. The comprehensive agreement of theoretical results with experimental observations on both torsionally relaxed and negatively supercoiled DNAs strongly indicates that, basestacking interactions, although short-ranged in nature, dominate the elasticity of DNA and hence are of vital biological significance.
Haijun Zhou
Yang Zhang
Zhong-Can Ou-Yang
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