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相关概念视频

Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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Initiation of Translation02:33

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Termination of Translation01:44

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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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Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
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相关实验视频

Updated: Jan 15, 2026

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using &#967;CRAC
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mRNA启动和终止是空间协调的

Ezequiel Calvo-Roitberg1, Christine L Carroll2, GyeungYun Kim2

  • 1RNA Therapeutics Institute, University of Massachusetts Chan Medical School, Worcester, MA, USA.

Science (New York, N.Y.)
|October 9, 2025
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概括

传递 RNA (mRNA) 的异型多样性是由转录开始和结束地点的选择驱动的. 一个定位启动终止轴 (PITA) 显示了这些位点的合使用,影响了基因表达动态.

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科学领域:

  • 分子生物学
  • 基因组学
  • 基因表达的调节

背景情况:

  • 传递 RNA (mRNA) 的异型多样性来自转录启动和终止.
  • 转录起点 (TSS) 和转录终点 (TES) 之间的相互作用尚不清楚.

研究的目的:

  • 调查转录开始和结束地点使用之间的关系.
  • 阐明控制mRNA异型多样性的机制.

主要方法:

  • 对转录起点和结束点的联合使用进行系统的分析.
  • 对基因长度,染色质特征和RNA聚合酶II流通速度的分析.

主要成果:

  • 使用上游TSS的mRNA优先使用上游TES,下游站点同样被合.
  • 一个位置启动终止轴 (PITA) 描述了基于基因组顺序的合替代TES使用.
  • 在具有特定染色体特征的较长基因中,PITA是普遍存在的.
  • mRNA 5' 起点选择影响3' 终点选择,受RNA聚合酶II速度的影响.

结论:

  • 空间组织和转录动态链接转录启动和mRNA 3'终端决策.
  • 这些结合的事件定义了mRNA异形表达模式.
  • PITA模型为理解协调的TSS和TES选择提供了一个框架.