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相关概念视频

Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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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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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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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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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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Translational Regulation01:29

Translational Regulation

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
106
Transcription Attenuation in Prokaryotes02:42

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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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Updated: Sep 16, 2025

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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停止编码子上下文通过翻译终结动力学调节NMD效率.

Dasa Longman1, Laura Monaghan1, Javier F Cáceres1

  • 1MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Crewe Road South, Edinburgh EH4 2XU, UK.

Cell genomics
|July 10, 2025
PubMed
概括
此摘要是机器生成的。

在停止编码子之前的甘氨酸残留物增强了无意义介导的mRNA衰变 (NMD). 这一发现解释了NMD的变异性,并有助于解释遗传变异,提高诊断准确度.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 生物化学 生物化学

背景情况:

  • 无意中介的mRNA衰变 (NMD) 是一种监测途径,可降解具有过早终止编码子 (PTC) 的异常mRNA.
  • 在不同的转录中,NMD的效率差异很大,导致基因表达的不可预测结果.
  • 了解影响NMD效率的因素对于解释遗传变异和疾病机制至关重要.

研究的目的:

  • 调查无意中介mRNA衰变 (NMD) 的可变效率的机制基础.
  • 为了识别特定的序列特征,调节NMD活动在过早终结子 (PTCs).
  • 为改善与PTC相关的遗传变异的解释提供一个框架.

主要方法:

  • 在表达不同上游序列的转录的细胞中分析mRNA衰变速率.
  • 位点定向的突变发生,以改变前置停止码子的氨基酸残留物.
  • 报告员分析量化NMD活动.

主要成果:

  • 立即在停止编码子上游的甘氨酸残留物被发现显著提高了NMD的效率.
  • 这些甘氨酸残留物促进了扩展翻译终结复合物的形成.
  • 这种延长的窗口增加了NMD参与的可能性.

结论:

  • 在停止编码子之前存在的甘氨酸残留物是NMD效率的关键决定因素.
  • 这种机制为NMD活动中观察到的变异性提供了新的解释.
  • 这些发现对基因变异的临床解释有直接影响,特别是那些产生PTC的基因变异.