Human cytosolic extracts stabilize the HIV-1 core

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• The stability of the human immunodeficiency virus type 1 (HIV-1) core is essential for viral replication.
• Understanding factors influencing HIV-1 core stability is critical for developing antiviral strategies.

Purpose of the Study:

• To develop a novel assay for measuring the in vitro stability of HIV-1 core complexes.
• To investigate the role of cellular factors in stabilizing the HIV-1 core.
• To evaluate the impact of antiviral drugs on HIV-1 core stability.

Main Methods:

• Development of a novel in vitro assay to measure HIV-1 CA-NC complex stability.
• Assessment of stabilization by cytosolic extracts and identification of specific cellular factors.
• Screening of antiviral compounds (PF74, CAP-1, IXN-053, cyclosporine, Bi2, CAI) for their effects on core stability.

Main Results:

• Cytosolic extracts significantly stabilize in vitro-assembled HIV-1 CA-NC complexes, indicating the presence of specific stabilizing cellular factors.
• The antiviral drugs PF74 and Bi2 strongly stabilized HIV-1 CA-NC complexes, while the peptide CAI destabilized them.
• Purified cyclophilin A destabilized complexes in a cyclosporine-sensitive manner, and recombinant CPSF6 stabilized them.

Conclusions:

• Cellular extracts contain specific factors that stabilize the HIV-1 core, which is crucial for infection.
• The developed assay is a powerful tool for assessing HIV-1 core stability in vitro and can aid in antiviral drug discovery.