SYNTHESIS OF PROBE MOLECULES, 6-(DIMETHYLAMINO)-2-PHENYLISOINDOLIN-1-ONES, FOR MECHANISTIC STUDIES OF FIREFLY...

Area of Science:

• Biochemistry
• Enzymology
• Chemical Biology

Background:

• Firefly luciferase is crucial for high-throughput screening via chemiluminescence detection.
• The enzyme catalyzes luciferin esterification with adenosine 5'-triphosphate (ATP) and coenzyme A (CoA).
• Previously, firefly luciferase was found to possess acyl-CoA synthetase activity, leading to enzyme deactivation via lysine-529 amidation.

Purpose of the Study:

• To elucidate the mechanism of firefly luciferase inhibition.
• To synthesize and characterize novel probe molecules that mimic a known inhibitor (F-53).
• To explore structure-activity relationships in luciferase inhibition.

Main Methods:

• Synthesis of two probe molecules (1 and 2) designed to mimic F-53.
• Molecule 1 features an azido-appended side chain.
• Molecule 2 incorporates both azido and carboxylic acid appended side chains, utilizing Horner-Wadsworth-Emmons and Sonogashira reactions for synthesis.

Main Results:

• Successful synthesis of two distinct probe molecules amenable to large-scale production.
• Demonstrated synthetic routes for incorporating azido and carboxylic acid functionalities.
• Established methods for probing enzyme inhibition mechanisms.

Conclusions:

• The synthesized probes provide valuable tools for investigating firefly luciferase inhibition.
• The study contributes to understanding enzyme deactivation pathways.
• The synthetic strategies are applicable for developing further enzyme inhibitors.