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Mechanisms of Coronavirus Nsp1-Mediated Control of Host and Viral Gene Expression

Keisuke Nakagawa1, Shinji Makino2,3,4,5,6

  • 1Laboratory of Veterinary Microbiology, Joint Department of Veterinary Medicine, Gifu University, Gifu 501-1193, Japan.

Cells
|February 5, 2021
PubMed

Insights

Coronaviruses use nonstructural protein 1 (nsp1) to suppress host gene expression and aid viral replication. This protein is a key factor in coronavirus pathogenicity and virulence.

Area of Science:

  • Virology
  • Molecular Biology
  • Pathogenesis

Background:

  • Viruses often disrupt host gene expression to promote viral replication.
  • Suppression of host gene expression, particularly antiviral responses, contributes to viral pathogenicity.
  • Understanding these mechanisms is crucial for deciphering virus-host interactions and pathogenesis.

Purpose of the Study:

  • To review the gene expression suppression functions of nonstructural protein 1 (nsp1) in coronaviruses (CoVs).
  • To focus on the roles of nsp1 from severe acute respiratory syndrome coronavirus (SARS-CoV) and Middle East respiratory syndrome coronavirus (MERS-CoV).
  • To highlight nsp1 as a potential major virulence factor in SARS-CoV-2.

Main Methods:

  • Literature review of studies on CoV nsp1 functions.
  • Comparative analysis of nsp1 functions across different CoVs, including SARS-CoV, MERS-CoV, and SARS-CoV-2.
  • Focus on mechanisms of host mRNA degradation and translation inhibition.

Main Results:

  • Nsp1 proteins from SARS-CoV and MERS-CoV share common functions in degrading host mRNAs and inhibiting host translation.
  • Viral mRNAs are selectively protected from nsp1-mediated cleavage.
  • SARS-CoV nsp1 is identified as a major pathogenic determinant, suggesting similar roles for SARS-CoV-2 nsp1.

Conclusions:

  • Nsp1 is a critical viral protein involved in suppressing host gene expression.
  • Nsp1 functions as a significant virulence factor in pathogenic coronaviruses.
  • Further investigation into SARS-CoV-2 nsp1 is warranted due to its high similarity to SARS-CoV nsp1.
Keywords:
coronaviruseshost gene expression suppressionmRNA degradationnsp1translational suppressionvirulence factor

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