吉亚迪亚端粒序列d(TAGGG) 4在K+溶液中形成两个分子内G四重复:循环长度和序列对折叠拓学的影响
Lanying Hu1, Kah Wai Lim, Serge Bouaziz
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
Journal of the American Chemical Society
|October 31, 2009
概括
吉亚迪亚的端粒序列在溶液中形成了两个不同的分子内G-四重复结构,揭示了G-四重复折叠的新见解. 这些发现表明,用于设计新型G-四方位拓的"切割粘贴"方法.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 遗传学 是一个遗传学.
背景情况:
- G四复合体是核酸二次结构,具有多样化的生物作用.
- 已知端粒序列形成G-四重复,其折叠拓受到序列和离子条件的影响.
- 之前的研究强调了G-通道长度对使用人类和Bombyx mori端粒序列的G-四折叠的影响.
研究的目的:
- 为了研究循环长度和序列变化对G-quadruplex折叠拓学的影响.
- 在离子的存在下确定Giardia端粒序列的结构特征.
- 探索设计和预测G-四重复结构的潜在原则.
主要方法:
- 核磁共振 (NMR) 光谱学被用来阐明三维结构.
- 在K ((+) 溶液中研究了四次重复的Giardia端粒序列d[TAGGG ((TAGGG) ((3) ].
- 结构分析的重点是识别G-四边形,基配对和循环安排.
主要成果:
- 吉亚迪亚的端粒序列形成了两个独特的分子内G-四重复结构.
- 第一个结构是一个新的篮型,反平行链式G-四重复,具有特定的循环配置 (边向-对角-边向).
- 第二个结构是一个螺旋类型的,平行链的G-四重复,具有双链反转环和多个G-四重复.
结论:
- 循环长度和序列显著影响G-quadruplex折叠拓,补充G-tract长度的影响.
- 已识别的结构元素表明,G-quadruplex设计的模块化"切割和粘贴"原则.
- 这一原理可以使预测和构建具有量身定制属性的新型G-四重复拓.
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