端粒RNA四重复-亚克里丁连接体识别的结构基础
Gavin W Collie1, Silvia Sparapani, Gary N Parkinson
1CRUK Biomolecular Structure Group, The School of Pharmacy, University of London, London, United Kingdom.
Journal of the American Chemical Society
|February 5, 2011
概括
端粒重复含有RNA (TERRA) 形成四重复结构. 晶体结构揭示了独特的RNA四重复-阿克里丁结合,涉及特定的循环构造,与DNA四重复不同,为治疗设计提供了洞察力.
科学领域:
- 结构生物学 结构生物学
- 在RNA生物学,RNA生物学.
- 药用化学 医学化学
背景情况:
- 人类端粒DNA被转录成称为TERRA的非编码RNA序列.
- TERRA 在端粒功能调节中发挥作用.
- TERRA可以形成更高阶的四重复结构,使它们成为潜在的治疗点.
研究的目的:
- 为了确定TERRA四重复-阿克里丁小分子复合物的晶体结构.
- 为了比较RNA四重复-亚克里丁复合体结构与其DNA对应物.
- 了解小分子与TERRA四重复合体结合的结构基础.
主要方法:
- 在2.60 Å分辨率的X射线晶体学.
- 双分子RNA四重复-亚克里丁复合物的结构分析.
- 与类似的DNA四重复-亚克里丁复合结构的比较.
主要成果:
- 确定了TERRA四重复-亚克里丁复合物的晶体结构.
- 双分子RNA复合体表现出具有类似螺旋的UUA循环的平行链拓.
- 这些环由涉及O2'基团的键稳定,积极结合亚克里丁分子,与DNA四重复合体中更简单的1:1结合不同.
- 与原生TERRA四重复相比,在RNA四重复中观察到显著的循环构造变化.
结论:
- TERRA四重复-亚克里丁复合体的独特结构特征,特别是UUA循环的作用,与DNA四重复合体有很大的不同.
- 这些发现对设计针对TERRA四重体的新型小分子有意义.
- 这项研究为更广泛地理解和准RNA四重复的结构基础提供了基础.
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