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Two-step binding mechanism for HIV protease inhibitors
E S Furfine1, E D'Souza, K J Ingold
1Division of Experimental Therapy, Wellcome Research Laboratories, Research Triangle Park, North Carolina 27709.
Biochemistry
|September 1, 1992
Summary
This study quantifies the binding kinetics of human immunodeficiency virus (HIV) protease inhibitors using spectrofluorometry. The determined rate constants and dissociation constants provide insights into inhibitor-enzyme interactions for potential therapeutic development.
Area of Science:
- Biochemistry
- Enzymology
- Pharmacology
Background:
- Human immunodeficiency virus (HIV) protease is a critical target for antiviral therapy.
- Understanding the kinetics of inhibitor binding is essential for developing effective drugs.
Purpose of the Study:
- To determine the rate constants for the binding of five HIV protease inhibitors.
- To characterize the dissociation kinetics of specific inhibitors from the enzyme-protease complex.
Main Methods:
- Stopped-flow spectrofluorometry was employed to measure binding rate constants.
- A fluorescence quenching method was utilized for two quinoline-2-carbonyl-Asn-Phe isomers.
- Enzyme-trapping assays determined dissociation rate constants.
- Time-dependent inhibition assays measured association rate constants.
Main Results:
- Binding and dissociation rate constants were determined for five HIV protease inhibitors.
- The kinetic data for one inhibitor (1S) indicated a two-step binding mechanism.
- Calculated dissociation constants (Kd) correlated with steady-state inhibition constants (Ki).
Conclusions:
- The study provides detailed kinetic parameters for HIV protease inhibitors.
- The spectrofluorometric methods developed are effective for characterizing inhibitor binding.
- These kinetic insights can inform the design of improved HIV-1 protease inhibitors.