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相关概念视频

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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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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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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.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells
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在P体中依赖细胞周期的mRNA定位.

Adham Safieddine1, Marie-Noëlle Benassy1, Thomas Bonte2

  • 1Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, 75005 Paris, France.

Molecular cell
|October 5, 2024
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概括

在整个细胞周期中,P体 (PBs) 动态地改变它们的RNA含量,揭示了不仅仅是简单地储存未翻译的mRNA的复杂调节. 这项研究揭示了及时的mRNA捕获和释放机制.

关键词:
在P体中,P体是P体.通过RNA成像进行RNA成像.RNA局部化的RNA局部化细胞循环中的细胞循环.没有膜的有机细胞.

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 在RNA生物学,RNA生物学.

背景情况:

  • 无膜有机体,如P体 (PBs),在RNA调节中起着至关重要的作用.
  • 了解RNA针对PBs的动态性质是阐明其功能的关键.
  • 细胞周期影响各种细胞过程,包括RNA代谢.

研究的目的:

  • 研究HEK293细胞细胞周期期间P体 (PBs) 和它们的RNA含量的动态变化.
  • 确定mRNA局部化到PBs与细胞循环进展和蛋白质表达的相关性.
  • 探索控制PBs中循环mRNA局部化的调控机制.

主要方法:

  • 在细胞周期的不同阶段净化PBs.
  • 在纯化的PB中分析RNA含量.
  • 单分子光在现场杂交 (FISH) 来可视化mRNA局部化模式.
  • 评估RNA特征 (例如,AU丰富度,长度) 和RNA结合蛋白 (RBP) 的参与.

主要成果:

  • 在整个细胞周期中观察到PBRNA含量的广泛变化,部分独立于全球RNA表达变化.
  • 在PBs中确定了明显的mRNA局部化模式,在G1,S或G2阶段达到峰值.
  • 实例显示,当编码的蛋白质不再是必需的时,PBs中及时捕获mRNA.
  • 循环mRNA定位是由RBPs (例如,G2中的HuR) 和特定RNA特征调节的,而不仅仅是翻译状态.
  • PB局部化的mRNAs富含AU,但在G1中较长,可能与转基因后的PB重组有关.

结论:

  • P体是动态调节枢纽,其RNA组成在细胞周期期间发生显著变化.
  • 对PBs的mRNA定位是一个受细胞周期阶段,RBPs和RNA特征影响的受调节的过程.
  • PBs的功能超出了未翻译的mRNA的被动储存库,在整个细胞周期中积极参与RNA管理.