| Issue |
Europhys. Lett.
Volume 62, Number 5, June 2003
|
|
|---|---|---|
| Page(s) | 760 - 766 | |
| Section | Interdisciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i2003-00336-3 | |
| Published online | 01 May 2003 | |
The bend stiffness of S-DNA
Department of Physics and Astronomy, University of Pennsylvania Philadelphia, PA 19104, USA
Corresponding author: storm@physics.upenn.edu
Received:
10
December
2002
Accepted:
8
April
2003
We formulate and solve a two-state model for the elasticity of
nicked, double-stranded DNA that borrows features from both the
Worm Like Chain and the Bragg-Zimm model. Our model is
computationally simple, and gives an excellent fit to recent
experimental data through the entire overstretching transition.
The fit gives the first value for the bending stiffness of the
overstretched state as about 
, a value
quite different from either B-form or single-stranded DNA.
PACS: 87.15.La – Biomolecules: Mechanical properties / 87.15.Aa – Biomolecules: Theory and modeling; computer simulation / 82.35.Lr – Physical properties of polymers
© EDP Sciences, 2003
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