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Identification of HIV-1 vpr product and function

E A Cohen1, E F Terwilliger, Y Jalinoos

  • 1Department of Human Retrovirology, Dana-Farber Cancer Institute, Harvard Medical School, Massachusetts 02115.

Journal of Acquired Immune Deficiency Syndromes
|January 1, 1990
PubMed

Insights

The viral protein R (Vpr) from HIV-1 accelerates viral replication and cell damage. Vpr enhances viral gene expression by acting on the HIV-1 LTR and other promoters.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Human immunodeficiency virus type 1 (HIV-1) replication is a complex process involving multiple viral proteins.
  • The function of viral protein R (Vpr) in HIV-1 replication and pathogenesis remains an area of active research.

Purpose of the Study:

  • To elucidate the specific role of the HIV-1 Vpr protein in viral replication and cytopathicity.
  • To characterize the molecular mechanisms by which Vpr influences viral gene expression.

Main Methods:

  • Construction of isogenic infectious HIV-1 proviruses differing solely in Vpr production.
  • Biochemical analysis to determine the size and characteristics of the Vpr protein product.
  • Assays to measure viral replication rates and cytopathic effects in T cells.
  • Reporter assays to assess the impact of Vpr on HIV-1 LTR and heterologous promoter activity.

Main Results:

  • Vpr encodes a 15 kDa protein of 96 amino acids.
  • Vpr significantly increases the rate of HIV-1 replication in T cells.
  • Vpr accelerates the cytopathic effects of HIV-1 infection.
  • Vpr acts in trans to upregulate viral protein expression.
  • Vpr enhances activity of the HIV-1 LTR and other promoters.

Conclusions:

  • The HIV-1 Vpr protein is a key determinant of accelerated viral replication and cytopathicity.
  • Vpr enhances HIV-1 replication by increasing viral gene expression, acting on the viral LTR and other promoters.
  • These findings highlight Vpr as a critical factor in HIV-1 pathogenesis and suggest potential therapeutic targets.

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