在大肠杆菌中通过5'-终端基配对控制RNase E介导的RNA降解
1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115.
Nature
|December 3, 1992
概括
RNase E是一种内核酶,对细菌信使RNA (mRNA) 降解至关重要. 它首选在5'末端分裂未配对核酸的RNA,从而影响大肠杆菌的mRNA衰变率.
科学领域:
- 分子生物学分子生物学
- 细菌的基因表达方式
- 降解RNA的降解RNA的降解
背景情况:
- 传递 RNA (mRNA) 半衰期在细菌中存在很大差异,影响基因表达.
- 控制mRNA稳定性的分子机制,特别是5'末端特征的作用,尚未完全理解.
- RNase E 是一种参与大肠杆菌mRNA降解的候选内核酶.
研究的目的:
- 为了研究Escherichia coli中的RNase E的基质特异性.
- 阐明RNase E在确定mRNA半衰期中的作用.
- 了解5'端结构如何影响细菌mRNA衰变速率.
主要方法:
- 利用RNA I的变体,一个小的未翻译RNA,作为RNase E.的基质.
- 在体外和体内测试的RNase E裂变活性.
- 分析了RNase E活动对散装和个人mRNA寿命的影响.
主要成果:
- RNase E表现出一种不寻常的基质特异性,更喜欢在5'端具有未配对核酸的RNA基质.
- 通过RNase E的裂变似乎是大肠杆菌中大多数mRNA降解的速度决定性步骤.
- 该酶对5'-终端基配对的敏感性表明它可以控制mRNA衰变的机制.
结论:
- 通过识别特定的5'端结构,RNase E在细菌mRNA降解中发挥着关键作用.
- 酶的基质偏好为5'末端特征如何调节 prokaryotes 中的 mRNA 稳定性提供了分子解释.
- 了解RNase E的功能是破译细菌基因表达调节的关键.
相关概念视频
Types of RNA
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...
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 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...
Types of 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 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...
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...


