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Highly Sensitive Assay for Measurement of Arenavirus-cell Attachment
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Highly Sensitive Assay for Measurement of Arenavirus-cell Attachment

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Assembly of arenavirus envelope glycoprotein GPC in detergent-soluble membrane microdomains

Sudhakar S Agnihothram1, Brooke Dancho, Kenneth W Grant

  • 1Montana Biotechnology Center, University of Montana, Missoula, Montana 59812, USA.

Journal of Virology
|July 24, 2009
PubMed

Insights

Hemorrhagic fever viruses like Junín virus (JUNV) assemble differently than expected. Their glycoprotein (GPC) forms distinct clusters, not typical lipid rafts, offering new insights into arenavirus replication.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Arenaviridae are a family of highly pathogenic viruses causing human hemorrhagic fevers.
  • Emergence of new arenaviruses is a public health and biodefense concern due to lack of vaccines or therapeutics.
  • Arenaviruses are enveloped viruses that bud from the plasma membrane.

Purpose of the Study:

  • To characterize the microdomain organization of the Junín virus glycoprotein (GPC) on the cell surface.
  • To understand the role of GPC clustering and its relationship with other viral proteins in arenavirus assembly.

Main Methods:

  • Immunogold electron microscopy was used to visualize GPC organization.
  • Cells infected with Junín virus (JUNV) and purified virions were analyzed.
  • Cold Triton X-100 detergent solubility was assessed to distinguish microdomains from lipid rafts.

Main Results:

  • JUNV GPC clusters into discrete microdomains (120-160 nm) independent of myristoylation or matrix protein Z coexpression.
  • These GPC microdomains are soluble in cold Triton X-100, differentiating them from conventional lipid rafts.
  • No spatial association was found between matrix protein Z and GPC microdomains during budding.

Conclusions:

  • Junín virus GPC forms unique, non-raft-associated microdomains crucial for its organization on the cell surface.
  • The lack of Z association with GPC microdomains suggests alternative mechanisms for virion assembly.
  • These findings provide novel insights into the molecular mechanisms underlying arenavirus morphogenesis.

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