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相关概念视频

Leaky Scanning02:28

Leaky Scanning

5.6K
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...
5.6K
Initiation of Translation02:33

Initiation of Translation

38.2K
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...
38.2K
Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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4.1K
Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

14.6K
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,...
14.6K
Ribosomes01:27

Ribosomes

10.2K
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome...
10.2K
Ribosomes01:27

Ribosomes

74.3K
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome...
74.3K

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相关实验视频

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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation
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在病毒蛋白合成过程中重编程核糖体.

Jemma Betts1, Chris H Hill1, Ian Brierley2

  • 1Biology, University of York, York, United Kingdom of Great Britain and Northern Ireland.

The biochemist
|December 17, 2025
PubMed
概括

病毒劫持宿主细胞核糖体进行蛋白质合成,使用专门的 ribosomes.

科学领域:

  • 分子生物学分子生物学
  • 病毒学 病毒学
  • 遗传学 是一个遗传学.

背景情况:

  • 病毒完全依赖宿主细胞核糖体来转化它们的遗传物质.
  • 核糖体是负责蛋白质合成的关键细胞机械,作为遗传信息的"编译器".
  • 核糖体功能的改变可能会产生重大后果,这是针对蛋白质合成的抗生素机制所证明的.

研究的目的:

  • 审查病毒重编码的发现和机制.
  • 探索RNA结构在病毒翻译重编程中的作用.
  • 概述病毒重编码中的突出的机制问题.

主要方法:

  • 关于病毒重编码现象的文献综述.
  • 分析RNA结构在翻译控制中的作用.
  • 识别理解病毒重编程的机制性差距.

主要成果:

  • 病毒已经发展出各种不同的策略来重新编程宿主细胞的翻译,集体称为"记录".
  • 重编码的例子包括核糖体框架转移和停止编码子的读取.
  • RNA结构在促进这些重编码事件方面发挥着重要作用.

结论:

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  • 病毒重编码代表了一种复杂的适应,用于从有限的病毒基因组优化基因表达.
  • 了解这些机制对于破译病毒生物学和开发抗病毒策略至关重要.
  • 需要进一步的研究,以充分阐明病毒重编码的机制细节.