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Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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Viral Replication: Lytic Cycle01:20

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Viral Replication: Lysogenic Cycle01:16

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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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DNA Bacteriophages01:26

DNA Bacteriophages

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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What are Viruses?00:50

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Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System
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合成細胞におけるファージのライフサイクル

Antoine Levrier1,2,3,4, Paul Soudier5, David Garenne5

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA. alt.levrier@gmail.com.

Nature communications
|December 15, 2025
PubMed
まとめ
この要約は機械生成です。

研究者らは、ウイルス感染を研究するための無細胞系を開発した。この合成細胞モデルはT7バクテリオファージを複製することに成功し、ウイルス学研究のための新しいプラットフォームを提供した。

キーワード:
合成細胞ウイルス感染T7ファージ無細胞系ウイルス複製

さらに関連する動画

Following Cell-fate in E. coli After Infection by Phage Lambda
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Last Updated: Jan 7, 2026

Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System
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科学分野:

  • ウイルス学
  • 合成生物学
  • 分子生物学

背景:

  • ウイルス感染は、すべての生物に見られる基本的な生物学的プロセスである。
  • ウイルス複製を研究するには通常、生きた宿主細胞が必要であり、インビトロでの調査が制限される。

研究 の 目的:

  • ウイルス感染サイクルの再構築と分析のための完全に無細胞なシステムの確立。
  • 特定の膜組成を持つ合成細胞を利用してウイルス複製を宿主とする。

主な方法:

  • 脂質膜上にリポ多糖を有する合成細胞の開発。
  • 合成細胞内での無細胞遺伝子発現システムの封入。
  • 合成細胞内でのT7ファージ感染サイクルの各ステップの追跡と定量化。

主要な成果:

  • 合成細胞内でのT7ファージの吸着、ゲノム侵入、複製、組み立ての実証。
  • 感染多重度や複製効率などの主要な感染パラメータの定量化。
  • リポソームサイズ制約とファージ再結合ダイナミクスの特定。

結論:

  • ウイルス感染研究のためのオールセルフリープラットフォームが正常に確立された。
  • このインビトロシステムは、ウイルス複製分子メカニズムを調査するための定義された多用途ツールを提供する。
  • このプラットフォームにより、個々の分子コンポーネントを使用したウイルス-宿主相互作用の詳細な研究が可能になる。