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相关概念视频

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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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
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Transcription01:10

Transcription

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Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
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Types of RNA01:20

Types of RNA

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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 regulating 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 Performs Diverse...
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The Nucleolus02:55

The Nucleolus

8.7K
The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Nuclear Protein Sorting01:34

Nuclear Protein Sorting

4.6K
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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相关实验视频

Updated: Jun 8, 2025

Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro

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活性RNA合成模式 核凝结物 核凝结物

Salman F Banani1,2,3, Andriy Goychuk4, Pradeep Natarajan5

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.

bioRxiv : the preprint server for biology
|November 5, 2024
PubMed
概括
此摘要是机器生成的。

活性RNA合成驱动非平衡状态,控制生物分子凝聚物模式. 这项研究揭示了RNA如何影响细胞凝聚物的大小,数量和间距,从而影响生物功能.

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Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism
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科学领域:

  • 细胞生物化学 细胞生物化学
  • 分子生物学分子生物学
  • 生物物理学的生物物理.

背景情况:

  • 生物分子凝聚物是组织细胞过程的必不可少的无膜器官.
  • 凝析物形成和溶解的机制已知,但模式原理 (大小,数量,间距) 尚不清楚.
  • RNA是凝聚剂动态的关键调节者.

研究的目的:

  • 研究RNA在调节生物分子凝聚物模式中的作用.
  • 阐明控制细胞内凝结物模式的物理原理.
  • 将凝结物模式与特定的生物功能联系起来.

主要方法:

  • 利用核纤维细胞中心 (FCs) 作为凝聚物模式的模型系统.
  • 抑制核糖体RNA合成以观察对FC模式的影响.
  • 应用物理理论和实验观测以建模凝结物的行为.
  • 操纵TCOF1表达,以评估对FC凝结物的模式和功能的影响.

主要成果:

  • 抑制核糖体RNA合成显著改变了FC模式.
  • 活性RNA合成被证明可以产生非平衡状态,阻止凝聚物粗化.
  • 一个模型被开发出来,得到了理论和实验的支持,解释了RNA在模式形成中的作用.
  • 通过TCOF1表达改变FC凝聚物模式,损害了核糖体RNA处理.

结论:

  • 活性RNA合成对于建立调节生物分子凝聚物模式的非平衡条件至关重要.
  • 凝聚物模式不仅仅是由平衡热力学决定的,而且是由活跃的细胞过程决定的.
  • 这项研究将凝结物的物理模式与它们的生物功能联系起来,特别是在RNA处理中.
  • 研究结果提供了关于细胞如何控制生化反应的空间组织的见解.