d(CGGTGGT) forms an octameric parallel G-quadruplex via stacking of unusual G(:C):G(:C):G(:C):G(:C) octads.

d(CGGTGGT) forms an octameric parallel G-quadruplex via stacking of unusual G(:C):G(:C):G(:C):G(:C) octads.
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DOI:
10.1093/nar/gkr489
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发表时间:
2011-09-01
影响因子:
14.9
通讯作者:
Mayol L
Mayol L
中科院分区:
生物学2区
文献类型:
--
作者:
Borbone N;Amato J;Oliviero G;D'Atri V;Gabelica V;De Pauw E;Piccialli G;Mayol L

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在非典型的DNA二级结构中,G-四链体目前被广泛研究,因为它们可能参与许多关键的生物学作用,并且它们在纳米技术中的潜在用途。整个四链体支架可以通过富含G的寡脱氧核糖核酸链的分子内或分子间组织表现出几种形态。特别是,几个富含G的链可以通过几个G-四链体单元之间的多聚化形成更高阶的组装体。在这里,我们报告一个新的二聚化途径的鉴定。我们对DNA序列dCGGTGGT的核磁共振、圆二色性、紫外光谱、凝胶电泳和质谱的研究表明,当在K+或NH 4+离子存在下退火时,该序列通过两个四分子G-四链体亚基经由不寻常的G(:C):G(:C):G(:C):G(:C)八联体的5′-5′堆叠形成八聚体。
Among non-canonical DNA secondary structures, G-quadruplexes are currently widely studied because of their probable involvement in many pivotal biological roles, and for their potential use in nanotechnology. The overall quadruplex scaffold can exhibit several morphologies through intramolecular or intermolecular organization of G-rich oligodeoxyribonucleic acid strands. In particular, several G-rich strands can form higher order assemblies by multimerization between several G-quadruplex units. Here, we report on the identification of a novel dimerization pathway. Our Nuclear magnetic resonance, circular dichroism, UV, gel electrophoresis and mass spectrometry studies on the DNA sequence dCGGTGGT demonstrate that this sequence forms an octamer when annealed in presence of K+ or NH4+ ions, through the 5′-5′ stacking of two tetramolecular G-quadruplex subunits via unusual G(:C):G(:C):G(:C):G(:C) octads.
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