HIV-1 Vpr and the G2 Checkpoint
Author Information
Author(s): Jason L DeHart, Erik S Zimmerman, Orly Ardon, Carlos MR Monteiro-Filho, Enrique R Argañaraz, Vicente Planelles
Primary Institution: University of Utah School of Medicine
Hypothesis
How does HIV-1 Vpr induce G2 checkpoint activation through the ubiquitin proteasome system?
Conclusion
HIV-1 Vpr manipulates a cullin 4/DDB1/DCAF1 E3 ubiquitin ligase complex, leading to degradation of an unknown protein that activates ATR and causes G2 arrest.
Supporting Evidence
- Vpr activates ATR through DNA replication stress.
- Proteasome inhibitors relieve Vpr-induced G2 arrest.
- DCAF1 is required for Vpr-induced G2 arrest.
Takeaway
HIV-1 Vpr is a protein that helps the virus stop cells from dividing by messing with the cell's recycling system, which normally helps control the cell cycle.
Methodology
The study used proteasome inhibitors and various cell transfections to analyze the role of Vpr in G2 arrest.
Digital Object Identifier (DOI)
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