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:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Harbury PA
Harbury PA
中科院分区:
其他
文献类型:
--
作者:
Mathew-Fenn RS;Das R;Harbury PA

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就其生物学固有的普遍存在的机械变形而言,DNA被认为表现为一根坚硬的弹性棒。在这里,我们使用金纳米晶体标记之间的小角 X 射线散射干扰来测量溶液中一系列 DNA 双螺旋的端到端长度的平均值和方差。该数据排除了传统的弹性杆模型。具体来说,端到端长度的方差遵循碱基对数量的二次相关性,而不是预期的线性相关性。在没有施加张力的情况下,DNA 比单分子拉伸实验测得的软度至少低一个数量级。我们的观察表明,DNA 拉伸在 DNA 双螺旋的两圈以上上是协同的,并支持通过 DNA 结构进行远程变构通讯的想法。
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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