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相关概念视频

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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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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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...
9.9K
RNA Structure01:19

RNA Structure

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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...
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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

10.6K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Termination of Translation01:44

Termination of Translation

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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相关实验视频

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Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays
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迷失在翻译中:神经元如何应对tRNA解码

Wei Guo1,2,3, Stefano Russo1,2,3, Francesca Tuorto2,3

  • 1Faculty of Biosciences, Heidelberg University, Heidelberg, Germany.

BioEssays : news and reviews in molecular, cellular and developmental biology
|July 11, 2024
PubMed
概括

转移RNA (tRNA) 修改对于有效的蛋白质翻译和神经元健康至关重要. 在tRNA修改中发生的干扰通过影响蛋白质合成和细胞应激反应,影响大脑发育和神经系统疾病.

关键词:
本地翻译本地翻译神经系统疾病 神经系统疾病没有去的mRNA衰变蛋白质翻译是蛋白质的翻译.核糖体质量控制质量控制tRNA的修改 tRNA的改变不折叠的蛋白质反应反应

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科学领域:

  • 分子生物学分子生物学
  • 神经科学是一个神经科学.
  • 遗传学 是一个遗传学.

背景情况:

  • 转移RNA (tRNA) 的转录后修饰对于准确的编码子识别和tRNA稳定性至关重要,影响蛋白质合成.
  • 新兴证据将tRNA修饰及其修饰酶与大脑发育中的关键过程和神经系统疾病的病因联系起来.
  • 在tRNA修改中的缺陷可能会损害代码子的识别和解码,导致蛋白质聚合,并触发具有有害影响的细胞应激反应.

研究的目的:

  • 审查tRNA修饰在神经元生理学和病理学中的特定作用.
  • 探索tRNA修改如何微调神经元内的局部翻译.
  • 讨论tRNA修改对蛋白质翻译和神经系统中相关细胞机制的影响.

主要方法:

  • 文献综述侧重于tRNA修饰的分子和细胞功能.
  • 对tRNA修饰与神经系统疾病相关的现有研究进行分析.
  • 讨论神经元功能的背景下,展开蛋白质响应 (UPR),核糖体质量控制 (RQC) 和no-go mRNA衰变 (NGD) 等机制.

主要成果:

  • TRNA修饰在调节神经元中的局部翻译方面发挥着重要作用.
  • 特定的tRNA修改涉及到神经系统的正常功能和疾病状态.
  • 调节失调的tRNA修改可以影响蛋白质翻译和激活压力反应途径,如UPR,RQC和NGD,影响神经元健康.

结论:

  • TRNA 修改是神经系统中蛋白质翻译的关键调节者.
  • 了解tRNA修饰和翻译机制之间的相互作用是解读它们在神经健康和疾病中的作用的关键.
  • 对tRNA修饰的进一步研究为神经系统疾病提供了潜在的治疗途径.