Vpr counteracts the restriction of LAPTM5 to promote HIV-1 infection in macrophages

Nat Commun. 2021 Jun 17;12(1):3691. doi: 10.1038/s41467-021-24087-8.

Abstract

The HIV-1 accessory proteins Vif, Vpu, and Nef can promote infection by overcoming the inhibitory effects of the host cell restriction factors APOBEC3G, Tetherin, and SERINC5, respectively. However, how the HIV-1 accessory protein Vpr enhances infection in macrophages but not in CD4+ T cells remains elusive. Here, we report that Vpr counteracts lysosomal-associated transmembrane protein 5 (LAPTM5), a potent inhibitor of HIV-1 particle infectivity, to enhance HIV-1 infection in macrophages. LAPTM5 transports HIV-1 envelope glycoproteins to lysosomes for degradation, thereby inhibiting virion infectivity. Vpr counteracts the restrictive effects of LAPTM5 by triggering its degradation via DCAF1. In the absence of Vpr, the silencing of LAPTM5 precisely phenocopied the effect of Vpr on HIV-1 infection. In contrast, Vpr did not enhance HIV-1 infection in the absence of LAPTM5. Moreover, LAPTM5 was highly expressed in macrophages but not in CD4+ T lymphocytes. Re-expressing LAPTM5 reconstituted the Vpr-dependent promotion of HIV-1 infection in primary CD4+ T cells, as observed in macrophages. Herein, we demonstrate the molecular mechanism used by Vpr to overcome LAPTM5 restriction in macrophages, providing a potential strategy for anti-HIV/AIDS therapeutics.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • CD4-Positive T-Lymphocytes / metabolism
  • CD4-Positive T-Lymphocytes / virology
  • Gene Silencing
  • HIV Infections / genetics
  • HIV Infections / metabolism*
  • HIV Infections / virology
  • HIV-1 / genetics
  • HIV-1 / metabolism*
  • HIV-1 / pathogenicity
  • HIV-2 / metabolism
  • HIV-2 / pathogenicity
  • Host Microbial Interactions* / genetics
  • Humans
  • Lysosomes / metabolism
  • Macrophages / metabolism*
  • Macrophages / virology*
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism*
  • Protein Serine-Threonine Kinases / metabolism
  • Protein Stability
  • Simian Immunodeficiency Virus / metabolism
  • Simian Immunodeficiency Virus / pathogenicity
  • Ubiquitin-Protein Ligases / metabolism
  • Up-Regulation
  • Virion / metabolism
  • vpr Gene Products, Human Immunodeficiency Virus / metabolism*

Substances

  • Membrane Proteins
  • vpr Gene Products, Human Immunodeficiency Virus
  • vpr protein, Human immunodeficiency virus 1
  • LAPTM5 protein, human
  • Ubiquitin-Protein Ligases
  • DCAF1 protein, human
  • Protein Serine-Threonine Kinases