High-resolution AFM structure of DNA G-wires in aqueous solution.
High-resolution AFM structure of DNA G-wires in aqueous solution.
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DOI:
10.1038/s41467-018-04016-y
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发表时间:
2018-05-17
影响因子:
16.6
通讯作者:
Phan AT
中科院分区:
文献类型:
--
作者:
Bose K;Lech CJ;Heddi B;Phan AT
We investigate the self-assembly of short pieces of the Tetrahymena telomeric DNA sequence d[G4T2G4] in physiologically relevant aqueous solution using atomic force microscopy (AFM). Wire-like structures (G-wires) of 3.0 nm height with well-defined surface periodic features were observed. Analysis of high-resolution AFM images allowed their classification based on the periodicity of these features. A major species is identified with periodic features of 4.3 nm displaying left-handed ridges or zigzag features on the molecular surface. A minor species shows primarily left-handed periodic features of 2.2 nm. In addition to 4.3 and 2.2 nm ridges, background features with periodicity of 0.9 nm are also observed. Using molecular modeling and simulation, we identify a molecular structure that can explain both the periodicity and handedness of the major G-wire species. Our results demonstrate the potential structural diversity of G-wire formation and provide valuable insight into the structure of higher-order intermolecular G-quadruplexes. Our results also demonstrate how AFM can be combined with simulation to gain insight into biomolecular structure. DNA and RNA G-quadruplexes can stack to form higher-order structures called G-wires. Here the authors report high-resolution AFM images of higher-order DNA G-quadruplexes in aqueous solution that could impact the design of G-wire based nanodevices and the understanding of G-wires in biology.
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影响因子:
14.9
作者:
Lech CJ;Heddi B;Phan AT
通讯作者:
Phan AT
影响因子:
29.4
作者:
Kotlyar, AB;Borovok, N;Porath, D
通讯作者:
Porath, D
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2.9
作者:
MARSH, TC;HENDERSON, E
通讯作者:
HENDERSON, E
影响因子:
16.6
作者:
Liu, Shott-Peng;Weisbrod, Samuel H.;Erbe, Artur
通讯作者:
Erbe, Artur
影响因子:
16.6
作者:
Chakraborty K;Veetil AT;Jaffrey SR;Krishnan Y
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