Winding single-molecule double-stranded DNA on a nanometer-sized reel.

Winding single-molecule double-stranded DNA on a nanometer-sized reel.
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DOI:
10.1093/nar/gks651
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发表时间:
2012-10
影响因子:
14.9
通讯作者:
Noji H
Noji H
中科院分区:
生物学2区
文献类型:
--
作者:
You H;Iino R;Watanabe R;Noji H

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以F1-ATPase为旋转马达蛋白,构建了一个纳米级卷轴分子系统。通过磁镊和光镊的结合,将单分子双链DNA(dsDNA)缠绕在分子卷轴上。dsDNA的抗弯刚度由缠绕张力(0.9-6.0 pN)和缠绕环的直径(21.4-8.5 nm)确定。我们的结果与传统的蠕虫链模型一致,并估计了其持续长度为54 ± 9 nm.这种分子卷轴系统为单分子研究急剧弯曲的DNA分子的微观力学提供了一个新的平台,并有望适用于阐明急剧弯曲的DNA链上的DNA缔合蛋白质的分子机制。
A molecular system of a nanometer-sized reel was developed from F1–ATPase, a rotary motor protein. By combination with magnetic tweezers and optical tweezers, single-molecule double-stranded DNA (dsDNA) was wound around the molecular reel. The bending stiffness of dsDNA was determined from the winding tension (0.9–6.0 pN) and the diameter of the wound loop (21.4–8.5 nm). Our results were in good agreement with the conventional worm-like chain model and a persistence length of 54 ± 9 nm was estimated. This molecular reel system offers a new platform for single-molecule study of micromechanics of sharply bent DNA molecules and is expected to be applicable to the elucidation of the molecular mechanism of DNA-associating proteins on sharply bent DNA strands.
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