DNA attraction in monovalent and divalent electrolytes.
DNA attraction in monovalent and divalent electrolytes.
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DOI:
10.1021/ja804802u
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发表时间:
2008-11-26
影响因子:
15
通讯作者:
Aksimentiev, Aleksei
中科院分区:
文献类型:
--
作者:
Luan, Binquan;Aksimentiev, Aleksei
The dependence of the effective force on the distance between two DNA molecules was directly computed from a set of extensive all-atom molecular dynamics simulations. The simulations revealed that in a monovalent electrolyte the effective force is repulsive at short and long distances, but can be attractive in the intermediate range. This attractive force is, however, too weak (~5pN per turn of a DNA helix) to induce DNA condensation in the presence of thermal fluctuations. In divalent electrolytes, DNA molecules were observed to form a bound state, where Mg2+ ions bridged minor groves of DNA. The effective force in divalent electrolytes was predominantly attractive, reaching a maximum of 42pN per one turn of a DNA helix.
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