Base-pair resolution analysis of the effect of supercoiling on DNA flexibility and major groove recognition by triplex-forming oligonucleotides
Base-pair resolution analysis of the effect of supercoiling on DNA flexibility and major groove recognition by triplex-forming oligonucleotides
复制标题
碱基对分辨率分析超螺旋对 DNA 柔性和三链体形成寡核苷酸识别主沟的影响
DOI:
10.1101/863423
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Pyne A
中科院分区:
文献类型:
--
作者:
Pyne A
In the cell, DNA is arranged into highly-organised and topologically-constrained (supercoiled) structures. It remains unclear how this supercoiling affects the detailed double-helical structure of DNA, largely because of limitations in spatial resolution of the available biophysical tools. Here, we overcome these limitations, by a combination of atomic force microscopy (AFM) and atomistic molecular dynamics (MD) simulations, to resolve structures of negatively-supercoiled DNA minicircles at base-pair resolution. We observe that negative superhelical stress induces local variation in the canonical B-form DNA structure by introducing kinks and defects that affect global minicircle structure and flexibility. We probe how these local and global conformational changes affect DNA interactions through the binding of triplex-forming oligonucleotides to DNA minicircles. We show that the energetics of triplex formation is governed by a delicate balance between electrostatics and bonding interactions. Our results provide mechanistic insight into how DNA supercoiling can affect molecular recognition, that may have broader implications for DNA interactions with other molecular species.
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影响因子:
16.6
作者:
Irobalieva RN;Fogg JM;Catanese DJ Jr;Sutthibutpong T;Chen M;Barker AK;Ludtke SJ;Harris SA;Schmid MF;Chiu W;Zechiedrich L
通讯作者:
Zechiedrich L
影响因子:
14.9
作者:
Sutthibutpong T;Matek C;Benham C;Slade GG;Noy A;Laughton C;K Doye JP;Louis AA;Harris SA
通讯作者:
Harris SA
DOI:
--
发表时间:
2020
期刊:
protocols.io
影响因子:
--
作者:
Philip J. Haynes;Kavit H. S. Main;Alice L Pyne
通讯作者:
Alice L Pyne
影响因子:
3.4
作者:
A. Noy;A. Maxwell;S. Harris
通讯作者:
A. Noy;A. Maxwell;S. Harris
影响因子:
2.9
作者:
J. Langowski;U. Kapp;K. Klenin;A. Vologodskii
通讯作者:
A. Vologodskii