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Size and Structure of Viral Genomes01:26

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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...
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Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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レトロウイルスの核細胞への統合の構造的基礎

Daniel P Maskell1, Ludovic Renault2, Erik Serrao3

  • 1Chromatin Structure and Mobile DNA, The Francis Crick Institute, Blanche Lane, South Mimms EN6 3LD, UK.

Nature
|June 11, 2015
PubMed
まとめ

原型発泡型ウイルスインタソームは,レトロウイルスDNA統合のために核細胞を捕獲します. この相互作用には,特定のDNAとヒストンの接触が含まれ,好ましいゲノム位置での統合を可能にします.

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科学分野:

  • 分子生物学は分子生物学である.
  • ウイルス学 ウイルス学 ウイルス学
  • 構造生物学 構造生物学とは

背景:

  • レトロウイルスDNAの統合は,インテグラーゼ (IN) 酵素によって媒介され,ウイルスのDNAに安定したインタソーム複合体を形成します.
  • 染色体DNAは核体配列に編成されており,インタソームが核体と相互作用して統合するメカニズムは解明されていません.

研究 の 目的:

  • 原型発泡性ウイルス (PFV) のインタソームが,レトロウイルス統合のために核群DNAと相互作用し,それを標的にする分子メカニズムの解明.

主な方法:

  • 単粒子の冷凍電子顕微鏡 (Cryo-EM) を用いて,インタソーム-ニュクレオソーム複合体の構造を決定した.
  • 特定のアミノ酸の置換がインタソーム-ニュクレオソームの相互作用と統合効率に与える影響を評価するために生化学的測定を行った.

主要な成果:

  • PFVインタソームは,DNAバイアスとH2A-H2Bヘテロダイマーの両方を含む多価相互作用を通じて,核細胞を安定的に捕獲します.
  • 統合は,H2A-H2B表面からDNAが引き上げられるため,好ましいスーパーヘリックス位置 (±3.5) で起こりますが,ヒストンオクタメアは無傷のままです.
  • これらの接触を妨げる突然変異は,核細胞の結合を損なうし,ゲノム内のウイルスの統合部位の分布を変化させます.

結論:

  • この研究は,ウイルスのDNA再結合機構による核細胞の認識と捕獲の分子基盤を明らかにしている.
  • 核粒子の可塑性,特にヒストンの表面からDNAを取り上げることができる能力は,特定のゲノム部位でのレトロウイルス統合を可能にするために極めて重要です.