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HIV-1 gp120 dimers decrease the overall affinity of gp120 preparations for CD4-induced ligands.

Mathieu Coutu1, Andrés Finzi2

  • 1Centre de Recherche du CHUM, Université de Montréal, Montreal, Quebec, Canada; Department of Microbiology, Infectiology and Immunology, Université de Montréal, Montreal, Quebec, Canada.

Journal of Virological Methods
|February 26, 2015
PubMed
Summary
This summary is machine-generated.

Aberrant disulfide-linked dimers of HIV-1 gp120 can affect ligand affinity. Removing these dimers restores gp120 affinity, crucial for understanding HIV-1 fusion and immunogenicity.

Keywords:
CD4-induced epitopesFPLCHIVSurface plasmon resonancegp120gp120 dimers

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Area of Science:

  • Virology
  • Structural Biology
  • Immunology

Background:

  • Tools to study HIV-1 envelope glycoprotein conformational changes are vital for understanding viral fusion and immunogenicity.
  • Over-expression of HIV-1 gp120 in mammalian cells can lead to aberrant disulfide-linked dimers.
  • These dimers may bias experimental results concerning gp120 ligand affinity.

Purpose of the Study:

  • To investigate the impact of aberrant disulfide-linked gp120 dimers on gp120 affinity for CD4-induced ligands.
  • To determine if removing these dimers restores gp120 affinity.
  • To assess the influence of glycosylation sites and variable regions on gp120 affinity.

Main Methods:

  • Expression of HIV-1 gp120 in mammalian cells.
  • Surface plasmon resonance (SPR) to evaluate gp120 affinity.
  • Purification of monomeric gp120.
  • Size exclusion chromatography to remove dimers.
  • Modification of glycosylation sites and variable regions (V4, V5).

Main Results:

  • Over-expressed gp120 forms aberrant disulfide-linked dimers that affect ligand affinity.
  • The presence of these dimers alters gp120 affinity for CD4-induced ligands.
  • Purification of monomeric gp120 and removal of dimers restored normal ligand affinity.
  • Removal of V4 glycosylation sites or V5 region did not affect monomeric gp120 affinity.

Conclusions:

  • Aberrant disulfide-linked dimers in gp120 expression systems significantly impact measured ligand affinities.
  • Standard size exclusion chromatography effectively removes these dimers, restoring gp120 affinity.
  • These findings are critical for accurate studies of HIV-1 envelope glycoprotein interactions and drug development.