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相关概念视频

Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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...
Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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

Chromatin Structure Regulates pre-mRNA Processing

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...
RNA Structure01:19

RNA Structure

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...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...

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相关实验视频

Updated: May 23, 2026

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
07:46

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity

Published on: October 8, 2018

对于tRNA修改在基因组结构和密码体使用中的作用.

Eva Maria Novoa1, Mariana Pavon-Eternod, Tao Pan

  • 1Institute for Research in Biomedicine, c/ Baldiri Reixac 15-21, 08028 Barcelona, Catalonia, Spain.

Cell
|April 3, 2012
PubMed
概括

两个特定的转移RNA (tRNA) 修改显著影响了所有生命王国的基因组组成. 考虑到这些修改,发现了编码子使用和tRNA基因频率之间的相关性,影响了基因表达.

科学领域:

  • 基因组学和分子生物学
  • 生物信息学和比较基因组学
  • 基因表达和基因调节

背景情况:

  • 转移RNA (tRNA) 基因含量是影响转化效率的关键基因组特征.
  • 不同生命王国的tRNA基因拷贝数和代码组合的规则仍然不清楚.
  • 以前的研究表明,基因组编码子使用率和tRNA基因频率之间缺乏相关性.

研究的目的:

  • 研究特定的tRNA修改对基因组结构和组成的影响.
  • 为了确定区分古老,细菌和真核基因组的关键tRNA修改.
  • 根据tRNA修饰,重新评估编码子使用和tRNA基因频率之间的相关性.

主要方法:

  • 对500多个不同的基因组进行比较基因组分析.
  • 特定王国特有的tRNA修饰的识别和表征.
  • 统计分析与tRNA基因组成,代码子使用和基因表达模式相关联.
  • 对人类基因表达的发现进行实验验证.

主要成果:

  • 两种特定的tRNA修改被确定为塑造古老,细菌和真核基因组的tRNA基因组成的主要驱动因素.
  • 当考虑这两个修改时,基因组编码子使用率和tRNA基因频率在所有王国之间显示出强烈的相关性.

更多相关视频

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
08:45

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry

Published on: April 21, 2022

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
11:08

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

相关实验视频

Last Updated: May 23, 2026

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
07:46

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity

Published on: October 8, 2018

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
08:45

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry

Published on: April 21, 2022

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
11:08

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

  • 这些修饰的存在或不存在解释了先前观察到的基因表达模式.
  • 实验数据证实,当考虑到这些修改时,人类基因表达与基因组编码组合相关.

    • 结论:

    • 特定的tRNA修改是基因组架构和tRNA基因组成的基本决定因素.
    • 这些修改调和了整个生命中编码子使用-tRNA基因频率相关性的差异.
    • 了解这些tRNA修饰提供了对基因表达和基因组进化的调节的关键见解.