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Inhibition of wild-type HIV-1 virus production by a matrix deficient Gag mutant

P P Lee1, M L Linial

  • 1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98104, USA.

Virology
|April 20, 1995
PubMed

Insights

Certain human immunodeficiency virus type 1 (HIV-1) Gag mutants interfere with wild-type virus production. Myristoylated matrix-deficient Gag mutants disrupt HIV-1 assembly, highlighting myristylation

Area of Science:

  • Virology
  • Molecular Biology
  • HIV Research

Background:

  • HIV-1 Gag protein is essential for viral assembly and release.
  • Specific Gag mutants can inhibit wild-type HIV-1 production.
  • Understanding Gag interactions is crucial for developing antiviral strategies.

Purpose of the Study:

  • To investigate the interference of two matrix-domain-deficient HIV-1 Gag mutants with wild-type virus production.
  • To determine the role of myristoylation in this interference mechanism.

Main Methods:

  • Transient expression assays were used to coexpress wild-type HIV-1 with Gag mutants.
  • Analysis of viral particle release, infectivity, and glycoprotein incorporation.
  • Comparison of myristoylated [myr(+)MA(-)] and non-myristoylated [myr(-)MA(-)] mutants.

Main Results:

  • The myristoylated matrix-deficient mutant [myr(+)MA(-)] significantly interfered with wild-type HIV-1 production.
  • The non-myristoylated mutant [myr(-)MA(-)] did not show significant interference.
  • Matrix-deficient mutants produced non-infectious particles with poor glycoprotein incorporation.

Conclusions:

  • Gag myristoylation plays a critical role in the interference with wild-type HIV-1 production.
  • Interactions between myristoylated Gag proteins occur during the viral assembly process.
  • Myristoylation has a more significant impact on the HIV-1 assembly pathway than the matrix domain.

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