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Dissociation of gp120 from HIV-1 virions induced by soluble CD4

J P Moore1, J A McKeating, R A Weiss

  • 1Chester Beatty Laboratories, Institute of Cancer Research, London, United Kingdom.

Science (New York, N.Y.)
|November 23, 1990
PubMed

Insights

Soluble CD4 (sCD4) binding to HIV-1

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • The CD4 antigen serves as the primary cellular receptor for Human Immunodeficiency Virus Type-1 (HIV-1).
  • HIV-1 entry into host cells involves interactions between viral glycoproteins gp120 and gp41 with the CD4 receptor.

Purpose of the Study:

  • To investigate the effect of soluble CD4 (sCD4) binding on the interaction between HIV-1 glycoproteins gp120 and gp41.
  • To elucidate the potential role of sCD4 in HIV-1 neutralization.

Main Methods:

  • Utilizing recombinant soluble CD4 (sCD4) and its purified V1 domain.
  • Observing the interaction of sCD4 with gp120 on HIV-1 virions.

Main Results:

  • Binding of sCD4 to gp120 induced rapid dissociation of gp120 from its complex with gp41.
  • This dissociation may represent an initial step in virus-cell and cell-cell fusion processes.
  • sCD4-induced shedding of gp120 from virions was observed.

Conclusions:

  • Soluble CD4 binding triggers the dissociation of HIV-1 envelope glycoproteins.
  • This shedding mechanism is a potential pathway for HIV-1 neutralization by sCD4.
  • Understanding these interactions is crucial for developing antiviral therapies.

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