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Elucidating the Antiviral Mechanism of Different MARCH Factors

Supawadee Umthong1, Brian Lynch1, Uddhav Timilsina1

  • 1Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA.

Mbio
|March 3, 2021
PubMed

Insights

Membrane-associated RING-CH (MARCH) proteins are E3 ubiquitin ligases that restrict retrovirus infection by preventing viral envelope glycoproteins from entering budding virions. This study reveals their broad antiviral functions and significance in cell-intrinsic immunity.

Area of Science:

  • Virology
  • Cell Biology
  • Immunology

Background:

  • Membrane-associated RING-CH (MARCH) proteins are E3 ubiquitin ligases involved in protein degradation.
  • Human MARCH1, 2, and 8 function as antiretroviral factors against human immunodeficiency virus type 1 (HIV-1).
  • The precise antiviral mechanisms of MARCH proteins require further elucidation.

Purpose of the Study:

  • To comprehensively analyze the antiretroviral mechanisms of the MARCH protein family.
  • To compare the functions of human and mouse MARCH proteins in restricting viral infections.
  • To investigate the broad-spectrum antiviral activity of MARCH proteins against various viruses.

Main Methods:

  • Utilized both human and mouse homologues of MARCH proteins.
  • Employed human immunodeficiency virus type 1 (HIV-1) and murine leukemia virus (MLV) models.
  • Performed a comprehensive analysis of viral envelope glycoproteins' interaction with MARCH proteins.

Main Results:

  • Demonstrated that MARCH proteins inhibit the incorporation of envelope glycoproteins into budding virions.
  • Identified differences in the restriction mechanisms among various MARCH proteins.
  • Showcased that human MARCH proteins exhibit broad antiviral activity against diverse viral envelope glycoproteins.

Conclusions:

  • MARCH proteins play a significant role in cell-intrinsic immunity against retroviruses.
  • MARCH proteins possess broad antiretroviral functions by targeting viral envelope glycoproteins.
  • Understanding MARCH protein mechanisms offers insights into novel antiviral strategies.

Keywords:
envelope glycoproteinshost restriction factorshuman immunodeficiency virusmurine leukemia virusretroviruses

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