糖形状控制 (6-4) 光产物在二核酸水平的形成
Céline Desnous1, B Ravindra Babu, Céline Moriou
1Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif sur Yvette, France, Nucleic Acid Center, Department of Physics and Chemistry, University of Southern Denmark, 5230 Odense M, Denmark.
Journal of the American Chemical Society
|December 12, 2007
概括
锁定核酸 (LNA) 双核酸仿真体表明,C2'-endo糖形状对于形成环丁金二元体,特别是 (6-4) 光产物至关重要.
科学领域:
- 摄影化学的使用.
- 核酸化学的核酸化学
- 结构生物学 结构生物学
背景情况:
- 胺二聚体是由紫外线辐射形成的DNA病变.
- 形成了两种主要类型的光产品:循环butan 胺二元体 (CPD) 和胺 (6-4) 胺光产品.
- 糖在DNA中的形状影响光产品的形成.
研究的目的:
- 为了研究糖形状在循环butan胺二元体的形成中的作用.
- 确定是否需要特定的糖形状来形成 (6-4) 光产品.
主要方法:
- 合成一个锁定核酸 (LNA) 双核酸模仿的thymidylyl-thymidine (TpT).
- 用254nm紫外线对LNA模仿和天然TPT进行辐射.
- 使用光谱方法分析形成的光产品.
主要成果:
- 这种LNA二核酸模仿物,与锁定C3的ahydro-endo糖,选择性地形成了循环butan胺二聚体.
- 自然的TPT,具有主要的C2无水内糖,产生了循环butan胺二聚体和 (6-4) 光产物.
- 这表明对 (6-4) 光产品形成的形状要求.
结论:
- 在形成 (6-4) 光产品的过程中,需要C2的ahydro-endo糖形状.
- 糖分的构成在确定UV照射产生的DNA光产品类型方面发挥着关键作用.
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