Remeasuring the double helix.
Remeasuring the double helix.
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DOI:
10.1126/science.1158881
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发表时间:
2008-10-17
期刊:
影响因子:
--
通讯作者:
Harbury PA
中科院分区:
文献类型:
--
作者:
Mathew-Fenn RS;Das R;Harbury PA
DNA is thought to behave as a stiff elastic rod with respect to the ubiquitous mechanical deformations inherent to its biology. Here, we measure the mean and variance of end-to-end length for a series of DNA double helices in solution, using small-angle X-ray scattering interference between gold nanocrystal labels. The data rule out the conventional elastic rod model. Specifically, the variance in end-to-end length follows a quadratic dependence on the number of base pairs rather than the expected linear dependence. Absent applied tension, DNA is at least one order of magnitude softer than measured by single-molecule stretching experiments. Our observations indicate that DNA stretching is cooperative over more than two turns of the DNA double helix, and support the idea of long-range allosteric communication through DNA structure.
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