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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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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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Lytic Cycle of Bacteriophages01:30

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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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Lysogenic Cycle of Bacteriophages00:43

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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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Author Spotlight: Investigating Bacteriophage-Induced Immune Responses in Gnotobiotic Mice
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T4 bacteriophage as a phage display platform.

Mariam Gamkrelidze1, Krystyna Dąbrowska

  • 1Agricultural University of Georgia, David Agmashenebeli Alley, 13th km, 0131, Tbilisi, Georgia, m.gamkrelidze@agruni.edu.ge.

Archives of Microbiology
|May 16, 2014
PubMed
Summary

Bacteriophage T4, a virus infecting bacteria, has been crucial for understanding fundamental biology. Its unique structure is now being explored for developing advanced vaccines and cancer therapies.

Area of Science:

  • Molecular Biology
  • Virology
  • Immunology

Background:

  • Bacteriophage T4 has been instrumental in elucidating key biological principles, including gene function, genetic code, and DNA replication.
  • The virus's unique structural features offer potential for novel biotechnological applications.

Purpose of the Study:

  • To highlight the historical significance of bacteriophage T4 in biological research.
  • To explore the potential of bacteriophage T4 as a platform for vaccine development and cancer therapy.

Main Methods:

  • Analysis of molecular events in T4-infected Escherichia coli.
  • Application of T4 bacteriophages for fundamental biological concept formulation.
  • Utilizing T4 capsid for antigen display (Hoc/Soc-fused antigens).

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  • Employing T4-based phage display with affinity chromatography for purification.
  • Main Results:

    • Bacteriophage T4 research established foundational concepts like nucleic acids as genetic material, gene definition, and the triplet genetic code.
    • T4 phage display enables efficient assembly of antigens on the capsid for potential vaccine and cancer therapy applications.
    • Demonstrated efficient display of HIV antigens on T4 capsid, suggesting potential for novel particulate vaccines.

    Conclusions:

    • Bacteriophage T4's historical contributions to biology are profound.
    • The T4 phage display system presents a promising platform for developing multicomponent vaccines and novel cancer therapies.
    • Further research into T4-based systems could lead to innovative solutions in vaccinology and oncology.