Statistical Physics of Unzipping DNA

Details Statistical Physics of Unzipping DNA Statistical Physics of Unzipping DNA

2003-09-24

arxiv.org/abs/cond-mat/0309559v1

Physics

Condensed Matter

Scientific paper

The denaturation of double-stranded DNA as function of force and temperature is discussed. At room temperature, sequence heterogeneity dominates the physics of single molecule force-extension curves starting about 7 piconewtons of below a ~15 pN unzipping transition. The dynamics of the unzipping fork exhibits anomalous drift and diffusion in a similar range above this transition. Energy barriers near the transition scale as the square root of the genome size. Recent observations of jumps and plateaus in the unzipping of lambda phage DNA at constant force are consistent with these predictions.

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