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相关概念视频

Improving Translational Accuracy02:07

Improving Translational Accuracy

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Translation01:31

Translation

14.7K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
14.7K
Types of RNA01:23

Types of RNA

63.4K
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...
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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...
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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...
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Updated: Jun 15, 2025

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

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细菌过程是否依赖于受tRNA修饰缺陷影响的全球核糖体暂停?

Valérie de Crécy-Lagard1, Zeynep Baharoglu2, Yifeng Yuan3

  • 1Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, USA; Genetics Institute, University of Florida, Gainesville, FL 32611, USA.

Journal of molecular biology
|April 10, 2025
PubMed
概括
此摘要是机器生成的。

转移RNA (tRNA) 修改中的缺陷广泛影响对转化速度敏感的细菌过程,影响调节蛋白和基因表达机制. 这项研究为了解这些对大肠杆菌和霍乱病毒等细菌的转化依赖效应提供了一个框架.

关键词:
埃舍里希亚大肠杆菌 (Escherichia coli) 是一个大肠杆菌.铁的平衡是铁的平衡.领导者酸的领导者酸运动性 运动性 运动性在tRNA修改过程中.

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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Isolation of Ribosome Bound Nascent Polypeptides in vitro to Identify Translational Pause Sites Along mRNA
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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
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科学领域:

  • 微生物学 微生物学
  • 分子生物学分子生物学
  • 基因组学就是基因组学.

背景情况:

  • 转移RNA (tRNA) 修改对于准确高效的蛋白质合成至关重要.
  • 翻译速度是影响细菌中各种细胞过程的关键因素.
  • 像大肠杆菌 (Escherichia coli) 和霍乱病毒 (Vibrio cholerae) 这样的模型生物对于研究基本生物机制至关重要.

研究的目的:

  • 假设tRNA修改中的缺陷如何广泛影响对翻译速度敏感的细菌过程.
  • 为了确定受tRNA修饰影响的特定的转化速度依赖的过程.
  • 研究单个和多个tRNA修饰对这些过程的影响.

主要方法:

  • 整合一个全面的文献综述.
  • 对转录基因数据的分析.
  • 蛋白质组数据的分析.
  • 对大肠杆菌 (Escherichia coli) 和霍乱病毒 (Vibrio cholerae) 的表型数据的分析.

主要成果:

  • 假设tRNA修改缺陷广泛影响翻译速度敏感的过程.
  • 对参与机动性和铁平衡的调节性蛋白质的翻译产生影响.
  • 观察到对领导驱动衰减机制的影响.
  • 发现一些过程受到单个修改的影响,而另一些需要多个修改.

结论:

  • 在tRNA修改中的缺陷显著影响细菌调节网络.
  • 翻译速度是将tRNA修饰与细胞功能联系起来的关键参数.
  • 这项工作为未来对tRNA修饰影响机制的研究奠定了基础.