Related Experiment Video
Updated: Jul 10, 2026
07:32
Phagosome Migration and Velocity Measured in Live Primary Human Macrophages Infected with HIV-1
Published on: September 5, 2016
HIV-1 Vpr is targeted for degradation by autophagy
Yuexuan Chen1, Susanne Klute2, Anju Bansal3
1Department of Microbiology and Immunology. University of Rochester Medical Center. Rochester, New York, United States of America.
Plos Pathogens
|March 2, 2026
Summary
HIV-1 Vpr protein is a novel target of autophagy, a cellular defense mechanism. Autophagy-sensitive Vpr restricts HIV-1 spread, offering new therapeutic avenues.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Autophagy plays a crucial role in innate immunity against viral infections like HIV-1.
- Previous research identified HIV-1 Gag as a target for autophagy-mediated degradation.
Purpose of the Study:
- To investigate HIV-1 Vpr, a key virulence factor, as a potential target of autophagy.
- To determine if Vpr from transmitted/founder viruses (TFVs) exhibits differential susceptibility to autophagy compared to lab-adapted strains.
Main Methods:
- Identification of autophagy-susceptible and resistant Vpr residues through comparative analysis of NL4-3 and TFV Vpr proteins.
- Investigation of Vpr interactions with autophagy receptors (NDP52, SQSTM1/p62, TAX1 BP1).
- Engineering of HIV-1 NL4-3 molecular clones with autophagy-sensitive or -resistant Vpr to assess impact on viral spread in vitro.
Main Results:
- HIV-1 Vpr from the lab-adapted NL4-3 clone is susceptible to autophagy, while Vpr from TFVs is resistant.
- Specific residues in NL4-3 Vpr (positions 37, 45, 77, 83-86, 93-94) confer autophagy susceptibility.
- Differences in these residues affect Vpr interaction with autophagy receptors NDP52, SQSTM1/p62, and TAX1 BP1.
- HIV-1 carrying autophagy-sensitive Vpr exhibited significantly reduced viral spread in 2D and 3D in vitro systems.
Conclusions:
- HIV-1 Vpr is a novel target for autophagy-mediated degradation.
- Vpr's susceptibility to autophagy significantly impacts HIV-1 replication and spread.
- Targeting Vpr-autophagy interactions presents a potential strategy for controlling HIV-1 infection.
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