How TRIM5α Protein is Degraded During HIV-1 Infection
Author Information
Author(s): Christopher Rold, James Aiken
Primary Institution: Vanderbilt University School of Medicine
Hypothesis
Restriction by TRIM5α leads to proteasomal degradation of a TRIM5α-viral protein complex.
Conclusion
HIV-1 infection causes rapid degradation of the TRIM5α protein through a proteasome-dependent mechanism.
Supporting Evidence
- TRIM5α is rapidly degraded upon encounter of a restriction-susceptible retroviral core.
- Proteasome inhibitors prevented the HIV-1-induced loss of TRIM5α.
- Destabilization of TRIM5α was correlated with the ability to block infection by the incoming virus.
- HIV-1 infection resulted in accelerated decay of endogenous TRIM5α in rhesus macaque cells.
- TRIM5α degradation was specific to restriction-sensitive viruses.
Takeaway
When HIV-1 enters a cell, a protein called TRIM5α that usually helps stop the virus gets broken down quickly, which makes it easier for the virus to infect the cell.
Methodology
The study involved inoculating TRIM5α-expressing human 293T cells with HIV-1 and measuring TRIM5α levels over time using quantitative immunoblotting.
Potential Biases
Potential bias due to the use of a single cell line and the effects of cycloheximide treatment.
Limitations
The study primarily used transduced 293T cells, which may not fully represent physiological conditions in natural host cells.
Participant Demographics
Human 293T cells and rhesus macaque cells were used in the experiments.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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