相关实验视频
Updated: Jul 16, 2026

09:05
MicroRNA-based Regulation of Picornavirus Tropism
Published on: February 6, 2017
概括
希拉细胞信使RNA (mRNA) 含有甲基基,其中6-甲基氨酸是最丰富的. 在mRNA的5'末端有一个独特的7-甲基瓜诺辛盖结构,这可能对真核细胞的功能至关重要.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 细胞基因表达的表达方式
背景情况:
- 聚基化[poly(A) +]mRNA在基因表达中起着至关重要的作用.
- 了解mRNA修饰,如甲基化,对于破译基因调节至关重要.
研究的目的:
- 为了研究来自HeLa细胞的poly(A) +mRNA中的甲基化核酸的类型和位置.
- 描述真核mRNA的5'终端结构.
主要方法:
- 使用聚U-粉色谱学分离聚A) + RNA.
- 使用放射性标记 ([3H-甲基] - 甲和14C-尿素) 和3H/14C比率量化甲基化水平的量化.
- 通过染色学和化学分析识别甲基化核化物.
主要成果:
- 聚甲基+RNA每1000个核酸中大约含有两组甲基.
- 确定了四种2'-O-甲基核核化物和两种基基甲基衍生物:6-甲基氨酸 (6MeA) 和7-甲基氨酸 (7MeG).
- 6MeA构成甲基化核核酸的~50%;7MeG (~10%) 仅在5'终端,形成一个帽子结构 (7MeGpppNmepNmep-).
结论:
- 细胞mRNA具有甲基化5'帽结构,主要是7-甲基瓜诺辛.
- 这种阻塞的5'终端很可能是功能性真核细胞mRNA的特征特征.
- 这些发现表明,在真核生物中,mRNA处理和翻译启动的机制得到了保护.
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...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
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...
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...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...

