Extreme bendability of DNA less than 100 base pairs long revealed by single-molecule cyclization.
Extreme bendability of DNA less than 100 base pairs long revealed by single-molecule cyclization.
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DOI:
10.1126/science.1224139
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发表时间:
2012-08-31
期刊:
影响因子:
--
通讯作者:
Ha T
中科院分区:
文献类型:
--
作者:
Vafabakhsh R;Ha T
The classical view of DNA posits that DNA must be stiff below the persistence length (<150 bp) but recent studies addressing this have yielded contradictory results. We developed a fluorescence-based, protein-free assay for studying the cyclization of single DNA molecules in real time. The assay samples the equilibrium population of a sharply bent, transient species which is entirely suppressed in single molecule mechanical measurements and is biologically more relevant than the ligated species sampled in the traditional ligase-based assay. The looping rate has a remarkably weak length dependence between 67 and 106 bp that can not be described by the worm-like chain model. Many biologically significant protein-DNA interactions that involve looping and bending of DNA below 100 bp likely use this intrinsic bendability of DNA.
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