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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...
11.9K
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

15.2K
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...
15.2K
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
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
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...
63.4K
Riboswitches01:56

Riboswitches

8.1K
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
8.1K

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相关实验视频

Updated: Jun 14, 2025

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

6.9K

在细菌体中温度依赖的tRNA修饰

Anne Hoffmann1,2, Christian Lorenz3, Jörg Fallmann2

  • 1Helmholtz Institute for Metabolic, Obesity and Vascular Research, Helmholtz Zentrum München of the University of Leipzig and University Hospital Leipzig, Philipp-Rosenthal-Str. 27, D-04103 Leipzig, Germany.

International journal of molecular sciences
|August 29, 2024
PubMed
概括
此摘要是机器生成的。

转移RNA (tRNA) 修改使细菌适应不同的温度. 热爱生物表现出增加的修饰,如4-thiouridine (s4U) 耐热性,而适应寒冷的细菌使用二uridine (D) 灵活性.

关键词:
基因组RNA的修饰是RNA的修饰.有关RNA测序的RNA测序细菌 细菌 细菌是一种细菌.这是一个tRNARNA.热适应 热适应 热适应

更多相关视频

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

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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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相关实验视频

Last Updated: Jun 14, 2025

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

6.9K
DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
11:19

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

Published on: February 25, 2011

19.9K

科学领域:

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

背景情况:

  • 转移RNA (tRNA) 修改对于调节RNA结构和功能至关重要.
  • 这些修改对于适应极端温度的生物至关重要,影响了转录的刚性和灵活性.

研究的目的:

  • 研究特定的tRNA修饰如何适应不同的细菌生长温度 (心理友好,中性友好,热友好).
  • 了解tRNA修饰在细菌耐热性和适应寒冷中的作用.

主要方法:

  • 采用RNA测序方法与tRNA样本的化学预处理相结合.
  • 在单核酸分辨率下系统地描述了四个关键的tRNA修饰:二氨酸 (D),4-氨酸 (s4U),7-甲基氨酸 (m7G) 和伪氨酸 (Ψ).
  • 在心理友好性 (P. halocryophilus,E. sibiricum),中性友好性 (B. subtilis) 和热性友好性 (G. stearothermophilus) 菌株中比较了tRNA修饰概况.

主要成果:

  • 每种细菌都表现出独特的tRNA修饰特征,尽管它们之间存在密切的遗传关系.
  • 热友细菌在最佳温度下显示了tRNA修饰的增加,特别是更高的s4U8和 Ψ55水平,这表明它在热耐受性中发挥了作用.
  • 心理友好型和中性友好型细菌表现出更高的D修饰,表明通过增强tRNA灵活性来适应寒冷环境的适应策略.

结论:

  • 细菌tRNA修饰模式是独特地适应特定的生长温度.
  • 像s4U和 Ψ这样的特定修饰有助于耐热性,而D增强了适应寒冷的生物的灵活性.
  • 开发的RNA测序方法对于精确的tRNA分析是有效的.