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High-performance hairpin-whiptail DNA target for HIV-1 integrase assay
Rebecca A Bourquin1, Alanna E Sorenson1, Patrick M Schaeffer1
1Biomedical Sciences and Molecular Biology, College of Medicine and Dentistry, James Cook University, Douglas, QLD 4811, Australia.
International Journal of Biological Macromolecules
|June 12, 2025
Summary
Researchers developed a novel hairpin-whiptail DNA structure to significantly enhance human immunodeficiency virus (HIV) integrase activity assays. This breakthrough aids in discovering new antiretroviral drugs to combat drug resistance.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Human immunodeficiency virus (HIV) integrase is a critical target for antiretroviral therapies.
- Increasing drug resistance necessitates novel therapeutic strategies and efficient screening tools.
- Current integrase assays often rely on DNA mimics of viral long terminal repeats (LTRs), with limited understanding of target site preferences.
Purpose of the Study:
- To investigate the impact of different DNA target sequences on HIV integrase activity assays.
- To identify novel DNA structures that improve the performance of integrase activity assays.
- To develop more efficient tools for drug screening against HIV integrase.
Main Methods:
- Evaluation of various DNA target sequences for HIV integrase activity.
- Development and testing of a hairpin-whiptail DNA structure.
- Assessing assay performance using quantitative polymerase chain reaction (qPCR) and isothermal fluorescent protein stability assays.
- Determining assay efficiency, reaction kinetics, and Z' scores.
- Validating assay utility with elvitegravir for IC50 determination.
Main Results:
- A novel hairpin-whiptail DNA structure was identified that significantly improved qPCR-based integrase activity assay performance.
- The hairpin-whiptail structure demonstrated compatibility with isothermal fluorescent protein stability assays.
- Maximal strand transfer reaction yields were achieved rapidly, within 5 minutes.
- The hairpin-whiptail DNA yielded an excellent Z' score of 0.758 in the qPCR assay, indicating suitability for high-throughput screening.
- The assay facilitated IC50 determination, as exemplified by elvitegravir.
Conclusions:
- The hairpin-whiptail DNA target structure represents a significant advancement for HIV integrase activity assays.
- This optimized assay format enhances drug screening capabilities and aids in developing therapies against resistant HIV strains.
- The developed assay is robust, efficient, and adaptable for various integrase assay platforms.
