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Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes

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A high-throughput assay for HIV-1 integrase 3'-processing activity using time-resolved fluorescence.

Ying-Shan Han¹, Peter Quashie, Thibault Mesplede

¹McGill University AIDS Centre, Lady Davis for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada.

Journal of Virological Methods

|May 16, 2012

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A new time-resolved fluorescence assay accurately measures HIV-1 integrase 3' processing activity. This sensitive method aids in discovering new inhibitors for HIV-1 integrase, a key antiviral target.

Area of Science:

Biochemistry
Virology
Drug Discovery

Background:

HIV-1 integrase (HIV-1 IN) is a validated target for antiviral therapies.
HIV-1 IN catalyzes viral DNA integration into the host genome via 3'-processing and strand transfer reactions.
Existing methods for measuring HIV-1 IN activity require optimization for sensitivity and throughput.

Purpose of the Study:

To develop and validate a sensitive, reproducible time-resolved fluorescence (TRF)-based assay for HIV-1 integrase 3'-processing (3'P) activity.
To assess the assay's utility in detecting anti-integrase compounds.
To establish a high-throughput screening method for identifying novel HIV-1 IN 3'P inhibitors.

Main Methods:

Development of a TRF-based assay using short DNA oligonucleotides mimicking viral LTR ends and purified HIV-1 IN.

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Optimization of assay parameters including reaction time, metal ion concentration, substrate, and enzyme concentrations.

Validation of the assay by measuring HIV-1 IN 3'P activity and its inhibition by known compounds.

Main Results:

A highly sensitive and reproducible TRF-based assay for HIV-1 IN 3'P activity was established and optimized.
The assay accurately measured HIV-1 IN 3'P activity.
The assay successfully detected the inhibitory effects of known 3'P inhibition compounds.

Conclusions:

The developed TRF assay provides a sensitive and reproducible method for measuring HIV-1 IN 3'P activity.
This assay is suitable for high-throughput screening.
The assay will facilitate the discovery of novel HIV-1 integrase 3'P inhibitors for antiviral drug development.