DNA condensation and redissolution: Interaction between overcharged DNA molecules

Details DNA condensation and redissolution: Interaction between overcharged DNA molecules DNA condensation and redissolution: Interaction between overcharged DNA molecules

2004-12-21

arxiv.org/abs/q-bio/0412039v2

Biology

Quantitative Biology

Biomolecules

26 pages, 10 figures

Scientific paper

10.1088/0953-8984/17/20/012

The effective DNA-DNA interaction force is calculated by computer simulations with explicit tetravalent counterions and monovalent salt. For overcharged DNA molecules, the interaction force shows a double-minimum structure. The positions and depths of these minima are regulated by the counterion density in the bulk. Using two-dimensional lattice sum and free energy perturbation theories, the coexisting phases for DNA bundles are calculated. A DNA-condensation and redissolution transition and a stable mesocrystal with an intermediate lattice constant for high counterion concentration are obtained.

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