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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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Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
09:33

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Published on: May 12, 2017

Stress granules in the viral replication cycle.

Hilda Montero1, Vicenta Trujillo-Alonso2

  • 1Instituto de Salud Pública, Universidad Veracruzana, Av. Luis Castelazo Ayala s/n, Col. Industrial Ánimas, 91190, Xalapa, Veracruz, México.

Viruses
|December 14, 2011
PubMed
Summary

Viruses activate protein kinase R (PKR) to inhibit protein synthesis and form stress granules (SGs). This review explores viral strategies to overcome SGs for efficient replication during cellular stress.

Keywords:
PKReIF2stressstress granules

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Area of Science:

  • Molecular Biology
  • Virology
  • Cellular Biology

Background:

  • Viruses are intracellular parasites dependent on host cells for replication.
  • Cellular antiviral responses include the activation of double-stranded RNA (dsRNA)-activated protein kinase R (PKR).
  • PKR activation leads to eukaryotic translation initiation factor 2 alpha (eIF2α) phosphorylation, inhibiting protein synthesis and forming stress granules (SGs).

Purpose of the Study:

  • To review the intricate relationship between viral replication and host cell stress granules.
  • To elucidate the diverse strategies viruses employ to navigate or manipulate SGs.
  • To understand how viruses ensure efficient replication amidst cellular stress responses.

Main Methods:

  • Literature review of recent studies on viral interactions with SGs.
  • Analysis of molecular mechanisms underlying PKR activation and SG formation.
  • Examination of viral countermeasures against SG-mediated inhibition.

Main Results:

  • Stress granules can impede the replication of various viruses.
  • Viruses have evolved sophisticated mechanisms to control SG formation and function.
  • These viral strategies are crucial for successful replication during cellular stress.

Conclusions:

  • Viral manipulation of SGs is a critical aspect of host-pathogen interactions.
  • Understanding these viral strategies provides insights into cellular antiviral defense.
  • Targeting SG modulation could offer novel antiviral therapeutic approaches.