Triggering HIV polyprotein processing by light using rapid photodegradation of a tight-binding protease inhibitor

Area of Science:

• Virology
• Biochemistry
• Drug Discovery

Background:

• HIV protease (PR) is essential for viral maturation and a key therapeutic target.
• The precise regulation and kinetics of HIV polyprotein processing are not fully understood.

Purpose of the Study:

• To design and utilize a novel, light-controlled HIV protease inhibitor.
• To enable synchronized induction of proteolysis and real-time analysis of HIV maturation.

Main Methods:

• Design, synthesis, and validation of a photodegradable HIV PR inhibitor with subnanomolar activity.
• Structural analysis of the HIV PR-inhibitor complex and its photolytic products.
• Demonstration of light-triggered restoration of enzymatic activity and viral particle processing.

Main Results:

• The inhibitor exhibits potent activity that is rapidly reduced by 4 orders of magnitude upon light irradiation.
• Photolysis fully restores enzymatic activity, allowing controlled proteolysis.
• Immature HIV particles can be induced to mature in real-time using light.

Conclusions:

• A novel tool for synchronized control of HIV protease activity has been developed.
• This photodegradable inhibitor facilitates real-time studies of HIV replication dynamics.
• The findings offer new avenues for understanding viral processing and developing therapeutics.