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Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
在DNA中的疏水性,非结合的基和基对
Barbara A Schweitzer1, Eric T Kool
1Contribution from the Department of Chemistry, University of Rochester, Rochester, New York 14627.
Journal of the American Chemical Society
|October 1, 2010
概括
合成DNA中的疏水基相似物显示有选择性的自我配对,挑战了稳定的DNA复合体的键的必要性. 这些发现表明,有可能将遗传密码扩展到自然基对之外.
科学领域:
- 合成生物学 合成生物学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 自然DNA依赖于由键介导的特定基配对 (A-T,G-C).
- 疏水性核糖类类似物为DNA基配对提供了替代结构.
- 了解合成基的配对特性对于DNA纳米技术和合成遗传学至关重要.
研究的目的:
- 为了研究合成DNA复合体中的金胺和纯氨酸的疏水性异体的配对特性和稳定性.
- 为了比较这些合成基对之间的结合亲和关系,以及与天然DNA基的结合亲和关系.
- 探索键在DNA双重稳定性中的作用以及扩展遗传密码的潜力.
主要方法:
- 疏水核酸的合成 (和类同类物).
- 这些核酸被纳入合成的寡氧氧核酸中.
- 热变质试验 (Tm测量) 用于评估在中性pH下双重稳定性.
主要成果:
- 疏水基类类似物与天然基具有非选择性的配对,但具有选择性的自我配对.
- 化合物2对自然基的自我配对具有显著的选择性 (6.5-9.3 °C Tm差异).
- 观察到的最高亲缘关系为1-1和2-2自对和1-2异对,与终端放置增强稳定.
结论:
- 键对于稳定的DNA类双重组形成可能并不必不可少.
- 溶解/解溶效应在基配对中至关重要,而键可能对特异性比亲和性更重要.
- 这些疏水性基对为扩展遗传密码提供了超越自然AT和GC对的可能性.
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