通过DExH/DRNA基酶对RNA-蛋白相互作用的活性破坏
E Jankowsky1, C H Gross, S Shuman
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. 02115, USA.
概括
DExH/D蛋白质对于RNA代谢和病毒复制至关重要,可以从RNA中取代蛋白质. 这种依赖ATP的活性表明,这些螺旋酶积极重组细胞中的核糖蛋白复合体.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 生物化学 生物化学
背景情况:
- DExH/D蛋白对于细胞RNA代谢和病毒复制至关重要,利用核三酸盐.
- 虽然已知可以解开RNA复合体,但它们在细胞环境中的蛋白质-RNA相互作用中的作用不太清楚.
- 大多数细胞RNA与蛋白质相关,形成核糖核蛋白 (RNP) 复合体.
研究的目的:
- 调查DExH/D蛋白是否可以影响RNA-蛋白相互作用.
- 确定疫苗病毒中的DExH蛋白NPH-II是否可以取代与RNA结合的蛋白质.
- 描述这种蛋白位移的机制和效率.
主要方法:
- 生物化学测试用于测量RNA中的蛋白质位移.
- 酶动力学来量化NPH-II对U1A解离率的影响.
- 亚丁三酸盐 (ATP) 依赖测试. 亚丁三酸盐 (ATP) 依赖测试.
- 在蛋白质移位过程中分析酶过程性.
主要成果:
- 疫苗病毒 DExH 蛋白质 NPH-II 活跃地将蛋白质 U1A 从 RNA 中取代.
- 这种位移取决于腺三酸盐 (ATP) 的水解.
- NPH-II加速了U1A解离的速度超过三倍.
- 在U1A从RNA的移位过程中,螺旋酶保持了过程性.
结论:
- DExH/D 蛋白质可以有效地催化蛋白质从RNA的位移.
- 这一功能表明DExH/D蛋白在RNP组件的结构重组中发挥了更广泛的作用.
- 这些发现为DExH/D蛋白调节RNA代谢和病毒复制的机制提供了新的见解.
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...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
RNA Editing
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
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...


