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相关概念视频

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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Leaky Scanning02:28

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Initiation of Translation02:33

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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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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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相关实验视频

Updated: Mar 11, 2026

Analysis of Termination of Transcription Using BrUTP-strand-specific Transcription Run-on TRO Approach
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在缺少停止子的mRNA上进行ArfA-RF2介导的翻译终结的结构基础

Paul Huter1, Claudia Müller1, Bertrand Beckert1,2

  • 1Gene Center, Department of Biochemistry and Center for integrated Protein Science Munich (CiPSM), Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377 Munich, Germany.

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概括

替代性救援因子A (ArfA) 拯救了在截断的mRNA上停滞不前的细菌核糖体. 这项研究显示ArfA

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科学领域:

  • 细菌翻译终结
  • 核糖体的救援机制
  • 分子冷电子显微镜

背景情况:

  • 细菌利用tmRNA,ArfA或ArfB来拯救停滞在缺少停止的截断mRNA上的核糖体.
  • 之前的结构研究阐明了tmRNA- 核糖体和ArfB- 核糖体复合体,但ArfA的机制仍然不清楚.

研究的目的:

  • 阐明ArfA识别截断的mRNA和招募释放因子2 (RF2) 的结构机制.
  • 确定与ArfA和RF2复合的截断mRNA上停滞的Escherichia coli70S核糖体的结构.

主要方法:

  • 在ArfA和RF2的截断mRNA上停滞的70S核糖体的冷电子显微镜 (cryo-EM) 重建.
  • 对ArfA,RF2和核糖体之间的分子相互作用进行结构分析.

主要成果:

  • ArfA的C端结合小核糖体子单元的mRNA入口通道,使截断和全长mRNA之间进行区分.
  • ArfA的N端与RF2的解码域相互作用,促进RF2的招募到停滞的核糖体.
  • 通过将GGQ基因定位在基转移酶中心,ArfA稳定了RF2的活性构造,模仿了正规终结.

结论:

  • 结构揭示了ArfA如何将RF2招募到停滞的核糖体.
  • ArfA促进了活跃的 RF2 构造,使得即使没有停止编码子,也可以实现翻译终结.
  • 这提供了对ArfA介导的核糖体救援途径的分子理解.