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相关概念视频

Transfer RNA Synthesis02:36

Transfer RNA Synthesis

11.9K
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...
11.9K
Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

9.2K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
9.2K
tRNA Activation02:26

tRNA Activation

19.1K
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...
19.1K
Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

7.0K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
7.0K
pre-mRNA Processing02:01

pre-mRNA Processing

52.8K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
52.8K
RNA Structure01:19

RNA Structure

4.7K
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...
4.7K

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相关实验视频

Updated: Jun 14, 2025

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

Published on: October 8, 2018

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在tRNA修改和处理之间的相互作用.

Jirka Peschek1, Francesca Tuorto2

  • 1Heidelberg University, Biochemistry Center (BZH), Heidelberg, Germany.

Journal of molecular biology
|May 22, 2025
PubMed
概括
此摘要是机器生成的。

转移RNA (tRNA) 对于蛋白质合成至关重要,并经历复杂的处理和化学修饰. 本综述详细介绍了真核细胞中的tRNA成熟过程,强调了酶功能和结构洞察力.

关键词:
酶-tRNA复合体中的酶.这是一个tRNARNA.在tRNA成熟过程中.tRNA的修改 tRNA的改变在tRNA处理过程中.

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Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
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Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry

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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro

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相关实验视频

Last Updated: Jun 14, 2025

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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Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
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Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry

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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro

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科学领域:

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

背景情况:

  • 转移RNA (tRNA) 对于蛋白质合成至关重要,在核糖体上解码遗传信息.
  • tRNA生物合成涉及广泛的加工和化学修饰,在RNA类中因其多样性和丰富性而独一无二.
  • 目前的理解主要依赖于酵母模型,但研究结果可以转化为更高的真核生物,包括人类.

研究的目的:

  • 在真核细胞中审查tRNA处理和修改步骤的顺序层次和相互作用.
  • 总结关于线粒体和细胞质tRNA以及tRNA类结构的知识.
  • 要突出最近的结构研究,阐明酶-tRNA复杂的功能.

主要方法:

  • 关于tRNA生物合成,加工和修饰的当前知识的文献综述.
  • 对以酵母模型为重点的研究分析及其对更高的真核生物的适用性.
  • 与酶-tRNA相互作用相关的最近结构生物学发现的综合.

主要成果:

  • 详细概述tRNA成熟路径的动态和顺序性质.
  • 确定关键酶及其在tRNA处理和修改中的作用.
  • 强调在不同真核细胞区 (细胞质和线粒体) 中保存的机制.

结论:

  • tRNA成熟是一个高度调节的,多步骤的过程,对细胞功能至关重要.
  • 了解酵母中的这些通路为研究人类tRNA生物学提供了一个框架.
  • 结构洞察对于破译酶介导的tRNA修改机制至关重要.