相关实验视频
Updated: Jul 12, 2026

06:59
Nanomanipulation of Single RNA Molecules by Optical Tweezers
Published on: August 20, 2014
一个单分子研究RNA催化和折叠
X Zhuang1, L E Bartley, H P Babcock
1Department of Physics, Stanford University, Stanford, CA 94305-4060, USA.
概括
单分子光显微镜揭示了Tetrahymena thermophila ribozymes复杂的折叠路径. 这种强大的技术揭示了很少观察到的状态和动态,对于理解RNA折叠机制至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- рибо酶是具有催化活性的RNA分子.
- 了解RNA折叠对于破译生物功能至关重要.
- 集合方法往往错过了短暂或罕见的分子状态.
研究的目的:
- 为了研究单个Tetrahymena thermophila ribozyme分子的折叠动态.
- 为了描述 ribozyme 折叠的过渡状态.
- 建立单分子光显微镜作为RNA折叠研究的工具.
主要方法:
- 利用光显微镜研究单个的 ribozyme 分子.
- 使用染料标记和表面固定的Tetrahymena thermophila ribozymes.使用染料标记和表面固定的Tetrahymena thermophila ribozymes.使用染料标记和表面固定的Tetrahymena thermophila ribozyme.
- 分析单分子时间轨迹以观察折叠事件.
主要成果:
- 观察到一个可逆的局部折叠步骤,涉及双重对接和解接.
- 描述过渡状态并确定折叠的速率常数.
- 确定了中间折叠状态和多个折叠路径,包括一个具有1Hz折叠率的新路径.
- 检测到一个很少有人居住的停靠状态,无法通过合奏技术测量.
结论:
- 单分子光显微镜为RNA折叠提供了前所未有的洞察力.
- 这项研究揭示了复杂的折叠动态和以前未观察到的Tetrahymena thermophila ribozymes的状态.
- 这种技术是检查单分子水平上RNA折叠机制的强大工具.
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 Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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 Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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...
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...

