Related Experiment Video
Updated: Apr 28, 2026
A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
Published on: August 31, 2014
A cell-intrinsic inhibitor of HIV-1 reverse transcription in CD4(+) T cells from elite controllers
Jin Leng1,2, Hsin-Pin Ho3, Maria J Buzon1,2
1Infectious Disease Division, Massachusetts General Hospital, Boston, MA, USA.
Abstract:
HIV-1 reverse transcription represents the predominant target for pharmacological inhibition of viral replication, but cell-intrinsic mechanisms that can block HIV-1 reverse transcription in a clinically significant way are poorly defined. We find that effective HIV-1 reverse transcription depends on the phosphorylation of viral reverse transcriptase by host cyclin-dependent kinase (CDK) 2 at a highly conserved Threonine residue. CDK2-dependent phosphorylation increased the efficacy and stability of viral reverse transcriptase and enhanced viral fitness. Interestingly, p21, a cell-intrinsic CDK inhibitor that is upregulated in CD4(+) T cells from "elite controllers," potently inhibited CDK2-dependent phosphorylation of HIV-1 reverse transcriptase and significantly reduced the efficacy of viral reverse transcription. These data suggest that p21 can indirectly block HIV-1 reverse transcription by inhibiting host cofactors supporting HIV-1 replication and identify sites of viral vulnerability that are effectively targeted in persons with natural control of HIV-1 replication.
Insights
Host cyclin-dependent kinase 2 (CDK2) phosphorylation enhances HIV-1 reverse transcriptase efficacy. The CDK inhibitor p21 blocks this phosphorylation, reducing viral replication and offering insights into natural HIV control.
Area of Science:
- Virology and Molecular Biology
- Immunology
Background:
- HIV-1 reverse transcription is a key target for antiviral drugs.
- Cell-intrinsic mechanisms controlling HIV-1 reverse transcription remain poorly understood.
- Elite controllers naturally control HIV-1 replication without antiretroviral therapy.
Purpose of the Study:
- To investigate host cell factors influencing HIV-1 reverse transcription efficacy.
- To explore the role of cyclin-dependent kinase 2 (CDK2) in HIV-1 replication.
- To understand the mechanism by which p21 contributes to natural HIV control.
Main Methods:
- Investigated the phosphorylation of HIV-1 reverse transcriptase by host CDK2.
- Assessed the impact of CDK2-dependent phosphorylation on reverse transcriptase efficacy and viral fitness.
- Examined the effect of p21, a CDK inhibitor, on HIV-1 reverse transcription in CD4(+) T cells.
Main Results:
- Effective HIV-1 reverse transcription requires phosphorylation of viral reverse transcriptase by host CDK2 at a specific Threonine residue.
- CDK2-dependent phosphorylation enhances reverse transcriptase efficacy, stability, and viral fitness.
- p21 potently inhibits CDK2-dependent phosphorylation of HIV-1 reverse transcriptase, significantly reducing reverse transcription efficiency.
Conclusions:
- p21 indirectly blocks HIV-1 reverse transcription by inhibiting host CDK2 activity.
- This mechanism highlights a host-dependent vulnerability of HIV-1 replication.
- Findings provide insights into natural HIV control strategies employed by elite controllers.
More Related Videos
08:11Assessing the Innate Sensing of HIV-1 Infected CD4+ T Cells by Plasmacytoid Dendritic Cells Using an Ex vivo Co-culture System.
Published on: September 1, 2015
09:26In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
Published on: October 15, 2013
Related Concept Videos
01:30Inhibitors of Viral Protein Synthesis
01:10Retrovirus Life Cycles