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Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells
Published on: January 30, 2019
Small molecular compounds inhibit HIV-1 replication through specifically stabilizing APOBEC3G.
Shan Cen1, Zong-Gen Peng, Xiao-Yu Li
1Department of Virology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Science, Beijing 100050, China.
The Journal of Biological Chemistry
|April 6, 2010
Summary
New compounds, IMB-26 and IMB-35, protect APOBEC3G (hA3G) from HIV-1 Vif degradation. These novel anti-HIV agents stabilize hA3G, suppressing viral replication and infectivity with high safety margins.
Area of Science:
- Virology
- Molecular Biology
- Drug Discovery
Background:
- APOBEC3G (hA3G) is a crucial host factor that inhibits human immunodeficiency virus type 1 (HIV-1) replication.
- HIV-1 Vif protein counteracts hA3G by inducing its degradation, facilitating viral propagation.
Purpose of the Study:
- To develop a screening system to identify compounds that prevent Vif-mediated hA3G degradation.
- To evaluate novel inhibitors as potential anti-HIV therapeutics by targeting hA3G stabilization.
Main Methods:
- Established a screening assay to detect inhibitors of Vif-induced hA3G degradation.
- Identified and characterized compounds IMB-26 and IMB-35 for their interaction with hA3G and suppression of Vif binding.
- Assessed the anti-HIV activity and safety profile of the identified inhibitors in vitro and in vivo.
Main Results:
- Compounds IMB-26 and IMB-35 specifically inhibited hA3G degradation by Vif.
- These inhibitors suppressed HIV-1 replication in cells expressing hA3G, with efficacy correlating to endogenous hA3G levels.
- IMB-26/35 treatment increased hA3G levels in HIV-1 particles, reducing viral infectivity and demonstrating a therapeutic index >200.
- IMB-26 showed high safety in vivo (LD(50) >1000 mg/kg).
Conclusions:
- IMB-26 and IMB-35 are novel anti-HIV lead compounds.
- Their mechanism involves direct binding to hA3G, preventing Vif interaction and subsequent degradation.
- These compounds represent a promising therapeutic strategy for HIV-1 by stabilizing the host antiviral factor hA3G.
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