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首页> 外文期刊>Biochemistry >Formation of G-Quadruplexes in Poly-G Sequences: Structure of a Propeller-Type Parallel-Stranded G-Quadruplex Formed by a G(15) Stretch
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Formation of G-Quadruplexes in Poly-G Sequences: Structure of a Propeller-Type Parallel-Stranded G-Quadruplex Formed by a G(15) Stretch

机译:聚集序列中的G-四共混物质:由G(15)拉伸形成的螺旋桨式平行链状G-四边形的结构

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摘要

Poly-G sequences are found in different genomes including human and have the potential to form higher-order structures with various applications. Previously, long poly-G sequences were thought to lead to multiple possible ways of G-quadruplex folding, rendering their structural characterization challenging. Here we investigate the structure of G-quadruplexes formed by poly-G sequences d(TTGnT), where n = 12 to 19. Our data show the presence of multiple and/or higher-order G-quadruplex structures in most sequences. Strikingly, NMR spectra of the TTG(15)T sequence containing a stretch of 15 continuous guanines are exceptionally well-resolved and indicate the formation of a well-defined G-quadruplex structure. The NMR solution structure of this sequence revealed a propeller-type parallel-stranded G-quadruplex containing three G-tetrad layers and three single-guanine propeller loops. The same structure can potentially form anywhere along a long G(n) stretch, making it unique for molecular recognition by other cellular molecules.
机译:在包括人的不同基因组中发现多G序列并具有各种应用的潜力形成高阶结构。以前,认为长聚术序列导致G-Quadreplex折叠的多种可能方法,使其结构表征具有挑战性。在这里,我们研究由Poly-G序列D(TTGNT)形成的G-Quadruplees的结构,其中n = 12至19.我们的数据显示在大多数序列中存在多个和/或高阶G-quadruplex结构。尖锐的是,含有15个连续鸟嘌呤的TTG(15)T序列的NMR光谱异常分解,并指示形成明确定义的G-Quadreplex结构。该序列的NMR溶液结构揭示了含有三个G-Tetrad层和三个单鸟嘌呤螺旋桨环的螺旋桨式平行链状G-四己。相同的结构可以沿着长g(n)拉伸潜在的任何地方,使其独特地由其他细胞分子进行分子识别。

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  • 来源
    《Biochemistry》 |2014年第49期|共6页
  • 作者单位

    Nanyang Technol Univ Sch Phys &

    Math Sci Singapore 637371 Singapore;

    Nanyang Technol Univ Sch Phys &

    Math Sci Singapore 637371 Singapore;

    Nanyang Technol Univ Sch Phys &

    Math Sci Singapore 637371 Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;
  • 关键词

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