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関連する概念動画

Retrovirus Life Cycles01:10

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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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Retroviruses

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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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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.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
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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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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...
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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Ty要素の転置: リバーストランスクリプトーゼとウイルスのような粒子.

D J Garfinkel, J D Boeke, G R Fink

    Cell
    |September 1, 1985
    PubMed
    まとめ
    この要約は機械生成です。

    リバーストランスクリプターゼの活性とウイルスのような粒子は,誘導されたTy元素を持つ酵母細胞で発見された. これは,Ty元素とレトロウイルスが共通の起源を共有し,これらの粒子の中で逆転写が起こることを示唆しています.

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    科学分野:

    • 分子生物学は分子生物学である.
    • イースト遺伝学 イースト遺伝学
    • レトロウイルス学 レトロウイルス学

    背景:

    • Ty元素は酵母に含まれるレトロトランポゾンです.
    • リバーストランスクリプターゼは,レトロウイルスの複製に不可欠な酵素です.
    • Ty元素の起源と複製メカニズムは完全に理解されていません.

    研究 の 目的:

    • Ty元素を含む酵母細胞における逆転写酵素の存在と活性を調べる.
    • Ty元素の活性に関連したウイルスのような粒子を特徴付けるために.
    • Ty要素とレトロウイルスとの関係を調査する.

    主な方法:

    • イーストのギャラクトース促進型Ty元素の誘導.
    • 粒子の成分を分離するために細胞分化.
    • リバーストランスクリプターゼの活性に対するアッセイ.
    • 粒子分子の内のRNAとタンパク質の成分を分析する.
    • イースト細胞の電子顕微鏡.

    主要な成果:

    • リバーストランスクリプターゼの活性とウイルスのような粒子は,誘導されたTy元素を持つ酵母細胞においてのみ検出されました.
    • リバーストランスクリプターゼ,Ty RNA,およびTy指定タンパク質が,粒子分数で共分化されている.
    • この複合体は,Ty元素全体に同質な製品を合成し,TyRNAの反転転写を粒子内に示した.
    • ウイルスのような粒子が観察されたが,非感染性であり,内A型粒子やコピア粒子に似ていた.

    結論:

    • TyRNAは酵母菌のウイルスのような粒子の中で逆転写をします.
    • イーストのいくつかの染色体Ty要素は,検出可能な逆転写酵素活性を示さないため,欠陥がある可能性があります.
    • タイ元素とレトロウイルスは,おそらく共通の進化的起源を共有している.