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HTLV-1 Gag protein associates with CD82 tetraspanin microdomains at the plasma membrane

Dmitriy Mazurov1, Gisela Heidecker, David Derse

  • 1National Cancer Institute, HIV Drug Resistance Program, Bld 535, Rm. 110, NCI-Frederick, Frederick, MD 21702-1201, USA.

Virology
|December 6, 2005
PubMed

Insights

Human T-lymphotropic virus type 1 (HTLV-1) Gag protein associates with CD82-enriched membrane microdomains in T cells. This interaction may facilitate the transport of new virions to cell adhesion sites.

Area of Science:

  • Virology
  • Cell Biology
  • Immunology

Background:

  • Tetraspanins, like CD82, form microdomains in the plasma membrane.
  • Human T-lymphotropic virus type 1 (HTLV-1) is an oncogenic retrovirus.
  • The role of viral proteins in membrane microdomain organization is crucial for viral lifecycle.

Purpose of the Study:

  • To investigate the association of HTLV-1 Gag protein with tetraspanin-enriched microdomains.
  • To determine if HTLV-1 Gag interacts with CD82 at the plasma membrane.
  • To understand the implications of this interaction for viral assembly and cell-to-cell transmission.

Main Methods:

  • Immunofluorescent staining and confocal microscopy.
  • Antibody-mediated cross-linking of cell surface proteins.
  • Co-immunoprecipitation assays.
  • Analysis of viral protein interactions under detergent-disrupted conditions.

Main Results:

  • HTLV-1 Gag protein colocalized with CD82 and other tetraspanins on the T cell plasma membrane.
  • HTLV-1 Gag concentrated in CD82 patches and segregated to the immune synapse.
  • CD82 associated with HTLV-1 matrix (MA) protein, requiring Gag multimerization and processing.
  • HIV-1 Gag did not show similar interactions with CD82.

Conclusions:

  • HTLV-1 Gag protein interacts with CD82-containing microdomains at the plasma membrane.
  • This association is independent of the viral envelope glycoprotein.
  • The interaction may facilitate the movement of new HTLV-1 virions to sites of cell-to-cell contact, aiding viral spread.

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