鉴定一种因米诺基团,这种基因不可或缺地被一个小的 ribozyme 分裂
Robert C Spitale1, Rosaria Volpini, Moriah G Heller
1Department of Chemistry, University of Rochester, RC Box 270216, Rochester, New York 14627-0216, USA.
Journal of the American Chemical Society
|April 10, 2009
概括
发针的 ribozyme 是一个发针.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 发针 ribozyme 是一种非编码RNA (ncRNA),它催化了RNA的分裂.
- 之前的研究发现,Ade38胺基组对催化作用至关重要.
- 针对Ade38的突变导致活性部位的错误折叠,阻碍了功能分析.
研究的目的:
- 为了研究 Ade38 imino 组在毛 ribozyme 催化中的作用.
- 使用保守的N1-deazaadenosine修饰来探测结构功能关系.
- 了解对利博酶活性的精确化学要求.
主要方法:
- 合成并将N1-deazaadenosine纳入发针 ribozyme 中.
- 生物化学测试以测量催化活性.
- 进行X射线结晶学以确定活性部位结构.
主要成果:
- 这种N1-deazaadenosine变体显著降低了 ribozyme 的活性.
- 晶体结构显示,尽管功能受损,活动部位折叠仍然完好无损.
- 伊米诺基团及其基质相互作用对于催化是必不可少的.
结论:
- 艾德38的伊米诺部分对于毛的利博酶功能至关重要.
- 单原子修饰对于研究ncRNA结构-功能是有效的.
- 这项研究阐明了特定化学组在RNA催化中的作用.
相关概念视频
Ribozymes
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.
Ribozymes can be...
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Ribozymes can be...
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