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Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
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A Protocol for Analyzing Hepatitis C Virus Replication
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Murine hepatitis virus nonstructural protein 4 regulates virus-induced membrane modifications and replication complex

Mark J Gadlage1, Jennifer S Sparks, Dia C Beachboard

  • 1Department of Pediatrics, Vanderbilt University Medical Center, D6217 MCN, 1161 21st Ave. S., Nashville, TN 37232-2581. mark.denison@vanderbilt.edu.

Journal of Virology
|October 23, 2009
PubMed
Summary

Murine hepatitis virus nonstructural protein 4 (nsp4) glycosylation is crucial for coronavirus replication. Mutations affecting nsp4 glycosylation sites impair virus growth and RNA synthesis by altering double-membrane vesicle morphology.

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Positive-strand RNA viruses remodel host cell membranes to create replication complexes.
  • Coronaviruses utilize replicase nonstructural protein 4 (nsp4) for the formation and organization of these replication complexes.

Purpose of the Study:

  • To investigate the glycosylation of MHV nsp4 at residues N176 and N237 during viral replication.
  • To determine the impact of nsp4 glycosylation on nsp4 function and murine hepatitis virus (MHV) replication.

Main Methods:

  • Engineered alanine substitutions (N176A, N237A, N176A/N237A) into the MHV-A59 genome.
  • Assessed virus viability, glycosylation, growth, and RNA synthesis.
  • Utilized electron microscopy to analyze the ultrastructure of infected cells, focusing on double-membrane vesicles (DMVs).

Main Results:

  • Mutant viruses with nsp4 glycosylation site alterations (N176A, N237A, N176A/N237A) were viable.
  • Mutations resulted in impaired virus growth and RNA synthesis, with N237A and N176A/N237A showing more severe defects.
  • Electron microscopy revealed aberrant morphology of virus-induced DMVs in nsp4 mutant infections, correlating with reduced viral RNA synthesis and growth.

Conclusions:

  • nsp4 plays a critical role in the organization and stability of coronavirus double-membrane vesicles (DMVs).
  • The structural integrity of DMVs is essential for efficient viral RNA synthesis and optimal coronavirus replication.