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Updated: Jun 18, 2026

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Nanomanipulation of Single RNA Molecules by Optical Tweezers
Published on: August 20, 2014
一个RNA聚合酶 ribozyme 的催化核心的晶体结构
David M Shechner1, Robert A Grant, Sarah C Bagby
1Whitehead Institute for Biomedical Research and Howard Hughes Medical Institute, 9 Cambridge Center, Cambridge, MA 02142, USA.
概括
快速起作用的RNA结合酶 рибо酶的晶体结构,对于RNA世界中的RNA复制至关重要,揭示了一个三脚架构. 这种结构表明一种类似于蛋白质聚合酶的催化机制,促进了我们对早期生命的理解. 关键词:RNA结合酶 ribozyme,RNA复制,RNA世界,蛋白质聚合酶.
科学领域:
- 生命的起源研究 生命的起源研究
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- RNA世界假设认为,RNA在DNA和蛋白质之前既是遗传物质,也是催化剂.
- 通过核糖酶 (催化性RNA分子) 复制RNA是自我维持的RNA世界的一个基本要求.
- 第I类RNA结合酶是一种具有高催化率的人工 ribozyme,接近RNA复制所需的聚合酶活性.
研究的目的:
- 为了阐明I类RNA结合酶 ribozyme的三维结构.
- 了解这种利博酶的催化活性的结构基础.
- 基于已确定结构,提出RNA复制催化的一个模型.
主要方法:
- 采用X射线晶体学,以3.0安格斯特罗姆分辨率确定I类RNA结合酶的结构.
- 结构分析的重点是核糖酶的结构,活性部位的组织,以及在结结处的相互作用.
主要成果:
- 晶体结构揭示了一个独特的"三脚架构",其中三个结构腿汇聚在结部位附近.
- 一个不配对的RNA段通过小沟相互作用与三脚架架相互作用,组织活性部位.
- 特定的核基和酸盐定位在结结处表明一种类似于蛋白质聚合酶的催化机制.
结论:
- 确定的结构为RNA复制机制提供了关键的洞察力.
- 这些发现支持在前生物时代RNA复制的可行性以及基于RNA的生命潜力.
- 与蛋白质聚合酶的结构相似性提供了RNA和蛋白质催化之间潜在的进化联系.
相关概念视频
RNA Structure
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...
RNA Structure
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...
RNA Structure
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...
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...
Ribozymes can be...
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...
Ribozymes can be...
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...

