Surface plasmon resonance study on HIV-1 integrase strand transfer activity

Area of Science:

• Biochemistry
• Molecular Biology
• Virology

Background:

• Understanding HIV-1 integrase (IN) molecular mechanisms is vital for developing effective AIDS therapies.
• A need exists for robust, fast, and sensitive methods to study IN activity.
• Current methods may lack the sensitivity or real-time monitoring capabilities required for comprehensive IN studies.

Purpose of the Study:

• To develop a real-time, label-free assay for monitoring HIV-1 integrase activity.
• To investigate the integration of viral double-stranded (ds) DNA into host DNA using surface plasmon resonance (SPR).
• To explore IN binding interactions with DNA targets and metal cofactors.

Main Methods:

• Development of a surface plasmon resonance (SPR) based assay.
• Real-time, label-free monitoring of HIV-1 integrase strand transfer reactions.
• Utilizing supercoiled plasmid (pUC 19) and short palindrome oligonucleotide as DNA targets.
• Investigation of IN binding to DNA complexes and triplexes with divalent ions.

Main Results:

• Successfully developed a real-time, label-free SPR assay for monitoring HIV-1 IN activity.
• Demonstrated direct monitoring of viral dsDNA integration into host DNA.
• Determined the surface density of integrated dsDNA.
• Investigated the influence of DNA target length and divalent ions on IN activity and binding.

Conclusions:

• The developed SPR assay is a valuable tool for studying HIV-1 IN activity.
• This assay can facilitate the discovery of novel strand transfer reaction inhibitors.
• It aids in studying compounds that interfere with IN-DNA binding for potential AIDS therapeutics.