The solution structures of higher-order human telomere G-quadruplex multimers.
The solution structures of higher-order human telomere G-quadruplex multimers.
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DOI:
10.1093/nar/gkaa1285
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发表时间:
2021-02-22
影响因子:
14.9
通讯作者:
Trent JO
中科院分区:
文献类型:
--
作者:
Monsen RC;Chakravarthy S;Dean WL;Chaires JB;Trent JO
Human telomeres contain the repeat DNA sequence 5′-d(TTAGGG), with duplex regions that are several kilobases long terminating in a 3′ single-stranded overhang. The structure of the single-stranded overhang is not known with certainty, with disparate models proposed in the literature. We report here the results of an integrated structural biology approach that combines small-angle X-ray scattering, circular dichroism (CD), analytical ultracentrifugation, size-exclusion column chromatography and molecular dynamics simulations that provide the most detailed characterization to date of the structure of the telomeric overhang. We find that the single-stranded sequences 5′-d(TTAGGG)n, with n = 8, 12 and 16, fold into multimeric structures containing the maximal number (2, 3 and 4, respectively) of contiguous G4 units with no long gaps between units. The G4 units are a mixture of hybrid-1 and hybrid-2 conformers. In the multimeric structures, G4 units interact, at least transiently, at the interfaces between units to produce distinctive CD signatures. Global fitting of our hydrodynamic and scattering data to a worm-like chain (WLC) model indicates that these multimeric G4 structures are semi-flexible, with a persistence length of ∼34 Å. Investigations of its flexibility using MD simulations reveal stacking, unstacking, and coiling movements, which yield unique sites for drug targeting.
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影响因子:
4.3
作者:
Flynn, Rachel Litman;Chang, Sandy;Zou, Lee
通讯作者:
Zou, Lee
影响因子:
14.9
作者:
Ambrus A;Chen D;Dai J;Bialis T;Jones RA;Yang D
通讯作者:
Yang D
影响因子:
64.8
作者:
Flynn, Rachel Litman;Centore, Richard C.;O'Sullivan, Roderick J.;Rai, Rekha;Tse, Alice;Zhou Songyang;Chang, Sandy;Karlseder, Jan;Zou, Lee
通讯作者:
Zou, Lee
影响因子:
14.9
作者:
Gao C;Liu Z;Hou H;Ding J;Chen X;Xie C;Song Z;Hu Z;Feng M;Mohamed HI;Xu S;Parkinson GN;Haider S;Wei D
通讯作者:
Wei D
DOI:
10.1002/actp.1989.010400306
发表时间:
1989-03-01
期刊:
ACTA POLYMERICA
影响因子:
--
作者:
FINK, HP;GEISS, D;FRIGGE, K
通讯作者:
FRIGGE, K