Rapid, sensitive and efficient HPLC assays for HIV-1 proteinase

Area of Science:

• Biochemistry
• Virology
• Analytical Chemistry

Background:

• Human immunodeficiency virus type 1 (HIV-1) proteinase is essential for viral maturation.
• Accurate measurement of HIV-1 proteinase activity is crucial for developing antiviral therapies.

Purpose of the Study:

• To develop sensitive and efficient assays for measuring HIV-1 proteinase activity.
• To establish methods for quantifying enzyme kinetics and substrate cleavage.

Main Methods:

• Development of two high-performance liquid chromatography (HPLC)-based assays.
• Assay 1: Utilizes UV detection for separation of unlabeled substrate and products.
• Assay 2: Employs a fluorescein-labeled peptide substrate with fluorescence detection for enhanced sensitivity and speed.

Main Results:

• Achieved detection of enzyme concentrations as low as 1 nM with the unlabeled assay.
• The fluorescein-labeled assay provides rapid analysis (<3 min) with minimal interference.
• Demonstrated the synthesis of fluorescein-labeled peptide substrates via solid-phase peptide synthesis.

Conclusions:

• The developed HPLC assays offer sensitive and versatile tools for HIV-1 proteinase activity measurement.
• The fluorescein-labeled assay represents a significant advancement in speed and sensitivity for enzyme activity studies.
• These assays can facilitate the discovery and evaluation of novel HIV-1 inhibitors.