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相关概念视频

Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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tRNA Activation02:26

tRNA Activation

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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相关实验视频

Updated: Jul 12, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Published on: September 7, 2017

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对于tRNA甲基化修饰研究的综合模型.

Qi Weng1,2, Feng Zhang1,3, Quan Zheng1,3

  • 1Quzhou People's Hospital The Quzhou Affiliated Hospital of Wenzhou Medical University Quzhou China.

MedComm
|October 24, 2023
PubMed
概括
此摘要是机器生成的。

类似甲基转移酶的1-WD重复域4 (METTL1-WDR4) 复合物在tRNA上修改了N7-甲基瓜诺辛 (m7G). 两个路径详细介绍了METTL1如何结合tRNA,并由WDR4和S-adenosylmethionine调节.

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Antibody-Free Assay for RNA Methyltransferase Activity Analysis
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Antibody-Free Assay for RNA Methyltransferase Activity Analysis

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An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
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An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity

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相关实验视频

Last Updated: Jul 12, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

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Antibody-Free Assay for RNA Methyltransferase Activity Analysis
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Antibody-Free Assay for RNA Methyltransferase Activity Analysis

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An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
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科学领域:

  • 分子生物学分子生物学
  • 生物化学 生物化学
  • 在RNA生物学,RNA生物学.

背景情况:

  • 转移RNA (tRNA) 修改对于蛋白质合成和基因调节至关重要.
  • N7-甲基瓜诺辛 (m7G) 是一种常见的tRNA修饰,影响tRNA结构和功能.
  • METTL1-WDR4复合体是负责tRNA上的m7G修饰的关键酶.

研究的目的:

  • 阐明由METTL1-WDR4复合体对m7G-tRNA修饰的分子机制.
  • 为METTL1-WDR4介导的tRNA甲基化提出两个不同的机制模型.

主要方法:

  • 结构生物学 (晶体学) 用于可视化复杂的形成.
  • 生物化学试验用于研究酶活性和基质结合.
  • 对不同研究小组的发现进行比较分析.

主要成果:

  • 路线A:WDR4充当支架,METTL1通过它的αC和α6螺旋在tRNA变量循环中甲基化G46.
  • 路线B:一个模型显示METTL1-WDR4介导的tRNA甲基化,包括S-adenosylmethionine在METTL1 N端结合的效果.
  • 突出了两条拟议的机械路线之间的差异和协议.

结论:

  • METTL1-WDR4复合体采用不同的结构相互作用来实现m7G-tRNA的修饰.
  • 了解这些机制可以了解tRNA质量控制和翻译调节.
  • 需要进一步的研究,以充分协调拟议的模型及其影响.