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相关概念视频

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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Ribosome Profiling02:24

Ribosome Profiling

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
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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...
18.9K
RNA Stability01:53

RNA Stability

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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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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...
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Protein Modifications in the RER01:26

Protein Modifications in the RER

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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal...
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相关实验视频

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An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
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通过Induro-tRNAseq对tRNA修饰的全基因组分析显示了协调的变化.

Yuko Nakano1, Howard Gamper1, Henri McGuigan1

  • 1Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, PA, USA.

Nature communications
|January 26, 2025
PubMed
概括

这项研究介绍了Induro-tRNAseq,一种使用Induro逆转录酶 (RT) 绘制全基因组tRNA修改图的新方法. 它克服了阅读修改后的tRNA的挑战,揭示了蛋白质平衡所必需的稳定修改模式.

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Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays
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Author Spotlight: AQRNA-seq Role in Mapping Small RNAs and Unraveling Protein Translation Mechanisms
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科学领域:

  • 分子生物学分子生物学
  • 基因组学就是基因组学.
  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.

背景情况:

  • 转移RNA (tRNA) 的转录后修饰对于基因表达调节至关重要.
  • 绘制这些修改是具有挑战性的,因为逆转录酶 (RT) 阅读困难.
  • 现有的方法难以准确量化全基因组的tRNA修改.

研究的目的:

  • 开发和验证一种用于绘制和量化全基因组tRNA修改的新方法.
  • 克服逆转录酶在修改后的tRNA中读透的局限性.
  • 在不同的人类和小鼠组织中分析tRNA修饰的景观和稳定性.

主要方法:

  • 在Induro-tRNAseq方法中利用了Induro,一个II组内核编码的RT.
  • Induro-tRNAseq可以选择性地克服在修改部位的RT停止,而不会增加错误整合.
  • 进行了对Induro与相关RT的比较分析,并评估了5个人类细胞系和3个小鼠组织的修饰.

主要成果:

  • 印鲁-tRNAseq使得随着时间的推移,tRNA修饰的渐进性读取.
  • 对比分析提供了数据集,用于预测修改影响.
  • 确定了跨tRNA序列的tRNA修饰的高度可变的景观.
  • 观察到对基因代码读取至关重要的修改的稳定.

结论:

  • Induro-tRNAseq是绘制和量化全基因组tRNA修改的一个有效工具.
  • 规则 (tRNA修饰) 模式是动态的,但对于基本功能而言稳定.
  • 对tRNA修饰的协调变化对于蛋白质稳态和细胞功能至关重要.