The parallel G-quadruplex structure of vertebrate telomeric repeat sequences is not the preferred folding topology under physiological conditions.

The parallel G-quadruplex structure of vertebrate telomeric repeat sequences is not the preferred folding topology under physiological conditions.
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DOI:
10.1093/nar/gkr174
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发表时间:
2011-07
影响因子:
14.9
通讯作者:
Dötsch V
Dötsch V
中科院分区:
生物学2区
文献类型:
--
作者:
Hänsel R;Löhr F;Foldynová-Trantírková S;Bamberg E;Trantírek L;Dötsch V

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在分子拥挤 (MC) 模拟物(即聚乙二醇 200 (PEG)、Ficoll 70 以及非洲爪蟾卵提取物)存在下,通过 CD 和 NMR 光谱以及非变性 PAGE 研究了脊椎动物端粒重复序列的 G-四链体拓扑。在这里,我们发现,在滑鼠卵提取物或聚蔗糖中,端粒重复序列的构象行为与 PEG 存在下观察到的显着不同。虽然 X. laevis 卵提取物或聚蔗糖中端粒重复的行为与稀释条件下获得的结果相似,但 PEG 促进了高阶平行拓扑的形成。我们的数据表明 PEG 不应用作 MC 模拟物。
G-quadruplex topologies of telomeric repeat sequences from vertebrates were investigated in the presence of molecular crowding (MC) mimetics, namely polyethylene glycol 200 (PEG), Ficoll 70 as well as Xenopus laevis egg extract by CD and NMR spectroscopy and native PAGE. Here, we show that the conformational behavior of the telomeric repeats in X. laevis egg extract or in Ficoll is notably different from that observed in the presence of PEG. While the behavior of the telomeric repeat in X. laevis egg extract or in Ficoll resembles results obtained under dilute conditions, PEG promotes the formation of high-order parallel topologies. Our data suggest that PEG should not be used as a MC mimetic.
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