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関連する概念動画

Viral Structure00:56

Viral Structure

73.5K
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
73.5K
The Replisome03:01

The Replisome

37.8K
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
37.8K
The Replisome03:01

The Replisome

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9.4K
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

607
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
607
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

558
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
558
Leaky Scanning02:28

Leaky Scanning

5.5K
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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Updated: Dec 25, 2025

Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus

Published on: July 27, 2021

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アレナウイルスの複製機構に関する構造的洞察

Ruchao Peng1,2, Xin Xu2, Jiamei Jing1,2

  • 1CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.

Nature
|March 28, 2020
PubMed
まとめ
この要約は機械生成です。

研究者は,ラッサとマチュポウイルスポリメラーゼの近原子構造を決定した. これらの発見は,ウイルスの複製を理解し,新しい抗ウイルス療法を開発するために不可欠なユニークな特徴と本質的な活性状態を明らかにしています.

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Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells
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Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells

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Highly Sensitive Assay for Measurement of Arenavirus-cell Attachment
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Highly Sensitive Assay for Measurement of Arenavirus-cell Attachment

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関連する実験動画

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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus

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Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells
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Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells

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Highly Sensitive Assay for Measurement of Arenavirus-cell Attachment
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科学分野:

  • ウイルス学
  • 構造生物学
  • 分子生物学

背景:

  • ラッサウイルスやマチュポウイルスは重度の出血熱や神経疾患を引き起こす.
  • ウイルスのRNA依存型RNAポリメラーゼは,ウイルスの転写と複製に不可欠であり,重要な抗ウイルス標的を表しています.
  • アレナウイルスのポリメラーゼ機能の構造的基礎は,この研究以前に未知であった.

研究 の 目的:

  • ラッサとマチュポウイルスポリメラーゼの近原子解像度構造を決定する.
  • アレナウイルスポリメラーゼの構造的特徴と規制メカニズムを解明する.
  • 新しい抗ウイルス薬の開発のための構造的基盤を提供すること.

主な方法:

  • 原子に近い解像度の構造を得るため,X線結晶学を用いた.
  • ポリメラーゼのアポ (無結合) とプロモーター結合の両方の構造を決定した.
  • 他のウイルスポリメラーゼと比較した構造分析が行われました.

主要な成果:

  • 構造は,アレーナウイルス特有の挿入ドメインを含む,ユニークな局所的な特徴を持つ保存された全体的なアーキテクチャを明らかにしました.
  • アレナウイルスのポリメラーゼの活性部位は,アロステル活性化を必要とするインフルエンザおよびブニアウイルスポリメラーゼとは異なり,本質的にオンになっています.
  • ポリメラーゼの活性が二酸化によって促進される.

結論:

  • 決定された構造は,アレーナウイルスポリメラーゼのメカニズムに前例のない洞察を提供します.
  • 独特の構造的特徴,特に固有の活性ポリメラーゼは,抗ウイルス薬の設計に新しい道を開きます.
  • これらの発見は,アレーナウイルスの複製の理解と公衆衛生上の脅威との闘いにおいて極めて重要です.