长距离三级相互作用在限制Tetrahymena组I ribozyme动态中的作用
Xuesong Shi1, Namita Bisaria, Tara L Benz-Moy
1Department of Biochemistry, ‡Department of Chemistry, §Department of Chemical Engineering, ∥Department of Physics, Stanford University , Stanford, California 94305, United States.
Journal of the American Chemical Society
|April 18, 2014
概括
突变的长距离接触在Tetrahymena组I ribozyme影响基质螺旋动力学和催化活性. 值得注意的是,活动与螺旋动力学有很强的相关性,揭示了RNA折叠和功能的独特机制.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 一组的 ribozymes 是必要的 RNA 催化剂.
- 长距离的三级接触对 ribozyme 的结构和功能至关重要.
- 了解RNA动态是阐明催化机制的关键.
研究的目的:
- 研究突变的特定远程三级接触对Tetrahymena I组 ribozyme动力学和催化作用的影响.
- 为了将基质螺旋动力学与催化活性相关联.
- 阐明三级接触影响基质结合和催化过程的独特机制.
主要方法:
- 在Tetrahymena组I ribozyme的位点导向突变发生.
- 在P1螺旋中使用光异性的合6 - - 甲基异多丁烯测定 ribozyme 动力学.
- 在各种条件下测量催化活性.
- 单分子Förster共振能量转移 (smFRET) 用于确定P1螺旋对接和解接的速率常数.
主要成果:
- 催化活性显示出强烈的正相关性 (R=0.94) 与P1螺旋异质性跨越五个数量级.
- 影响远距离接触的突变对P1螺旋对接有累积的影响.
- 确定了不同的机制:P14突变增强了形状灵活性,而金属核心突变破坏了对接点.
结论:
- 长距离的三级接触通过不同的机制批判性地调节Tetrahymena I组的 ribozyme 动力学和催化.
- P1螺旋动态作为全球RNA结构变化和催化效率的可靠指标.
- 光异构是一种有价值的工具,用于探测复杂的RNA系统中的本地和全球动态,有助于理解RNA和RNA-蛋白质复合体的功能.
相关概念视频
Ribozymes
10.0K
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...
Ribozymes can...
10.0K
Ribozymes
2.7K
2.7K
RNA Structure
6.6K
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
6.6K
RNA Structure
68.9K
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
68.9K
Types of RNA
61.3K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
61.3K
Types of RNA
13.9K
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
13.9K


