Conjugated polyelectrolyte based real-time fluorescence assay for phospholipase C.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Enzyme Assays

Background:

• Phospholipase C (PLC) plays a crucial role in cellular signaling and pathogenesis.
• Accurate and sensitive detection of PLC activity is essential for research and diagnostics.
• Existing methods for PLC detection can be complex or lack real-time capabilities.

Purpose of the Study:

• To develop a novel, sensitive, and real-time fluorescence turnoff assay for Clostridium perfringens phospholipase C (PLC).
• To utilize the interaction between a conjugated polyelectrolyte (CPE) and phosphatidylcholine for enzyme detection.
• To enable kinetic analysis and study of PLC modulators.

Main Methods:

• A fluorescence turnoff sensor was designed using a water-soluble conjugated polyelectrolyte (CPE) and phosphatidylcholine.
• The assay relies on the disruption of a CPE-lipid complex by PLC-catalyzed hydrolysis of phosphatidylcholine.
• Fluorescence intensity changes were monitored in real-time to quantify PLC activity.

Main Results:

• The assay demonstrated a fluorescence turnoff response upon PLC activity.
• The detection limit for PLC was found to be less than 1 nM.
• The assay successfully quantified substrate concentrations in the micromolar range and allowed for kinetic parameter determination.
• PLC activation by Ca2+ and inhibition by EDTA and fluoride ions were observed.

Conclusions:

• A convenient, rapid, and real-time fluorescence turnoff assay for PLC activity has been successfully developed.
• The assay offers high sensitivity and enables detailed kinetic studies of PLC.
• This method provides a valuable tool for investigating PLC function and its modulators.