结构,水分和热稳定性在形式乙烯基改性寡核酸中的相互作用:RNA可能比DNA更好地容忍非离子改性
Andrej Kolarovic1, Emma Schweizer, Emily Greene
1Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, USA.
Journal of the American Chemical Society
|October 15, 2009
概括
形式的修改稳定了RNA螺旋,但破坏了DNA螺旋的稳定,这表明RNA比DNA更好地容忍脊柱变化. 这一发现对于基于RNA的基因控制策略至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 橄核酸的化学成分
背景情况:
- DNA和RNA寡核酸是遗传过程的基础.
- 了解骨干修改是开发新型核酸应用的关键.
- 形式乙链接为传统的酸盐骨干提供了一个非离子替代品.
研究的目的:
- 研究DNA和RNA中甲基甲酸核酸间链接的结构和热力学影响.
- 为了比较甲基甲基修饰对RNA与DNA双螺旋稳定性和水分的影响.
- 探索形式乙在基于核酸的技术中作为酸模拟物的潜力.
主要方法:
- 合成DNA和RNA寡核酸与形式酸链接.
- 紫外线热化分析以评估螺旋体的稳定性.
- 透应激研究,以评估水分变化.
- 用X射线晶体学来确定高分辨率结构.
主要成果:
- 形式乙烯链接显著稳定RNA螺旋体 (+0.7°C),但破坏DNA螺旋体的稳定 (-1.6°C).
- 形式乙烯的修改减少了DNA水合,但对RNA水合的影响很小.
- X射线晶体学揭示了甲基酸链接与A型DNA螺旋体内很好地匹配.
结论:
- 与DNA相比,RNA对非离子骨干修饰 (如甲基甲) 的耐受性更强.
- 甲基作为RNA中酸盐连接的有效模仿剂.
- 形式乙烯的修改对基础研究和基于RNA的基因控制策略具有前景,包括RNA干扰.
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