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一个RNA活性位点的表征:Diels-Alderase ribozyme及其基质和产物之间的相互作用
Friedrich Stuhlmann1, Andres Jäschke
1Department of Biology, Chemistry and Pharmacy, Institute of Chemistry, Free University of Berlin, Thielallee 63, D-14195 Berlin, Germany.
Journal of the American Chemical Society
|March 28, 2002
概括
迪尔斯-阿尔德拉酶 ribozymes 催化碳-碳键的形成. 化学分析揭示了RNA-diene堆叠相互作用控制基质结合和立体选择反应,突出了复杂的 ribozyme 活性位点控制.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 有机化学 有机化学
背景情况:
- рибо酶是具有催化活性的RNA分子.
- 迪尔斯-阿尔德拉酶核酶催化迪尔斯-阿尔德反应,形成碳-碳键.
- 了解酶-基质相互作用是它们催化机制的关键.
研究的目的:
- 为了阐明Diels-Alderase ribozymes及其基质/产物之间的相互作用.
- 为了确定基质结合和催化活性的结构要求.
- 了解 ribozymes 如何实现立体选择性催化.
主要方法:
- 化学替代分析使用44种系统地变化的类似物.
- 研究了RNA-diene相互作用,键和金属离子协调.
- 分析基质和产品的结合性要求.
主要成果:
- RNA-diene相互作用主要由堆叠相互作用来控制.
- 需要对二烯 (烯衍生物) 和二烯基 (马利伊米基环) 具有特定的结构特征.
- ribozyme 在循环添加反应中表现出 enantioselectivity 和 diastereoselectivity.
- 在二烯基上,疏水性侧链对RNA结合有显著的贡献.
- RNA与循环添加产物有强烈和立体选择性的相互作用.
结论:
- 利博酶活性位点是复杂的,控制反应基于微妙的基质差异.
- 堆叠相互作用对于RNA-diene结合和立体化学控制至关重要.
- 迪尔斯-阿尔德拉酶核酶可以通过特定的分子识别精确地控制化学途径.
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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
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Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...

