A membrane-associated, fluorogenic reporter for mammalian phospholipase C isozymes

Area of Science:

• Biochemistry
• Cell Biology
• Molecular Pharmacology

Background:

• Cell-surface receptors activate phospholipase C (PLC) isozymes, crucial for cellular signaling.
• Aberrant PLC regulation is implicated in diseases such as cancer and inflammatory conditions.
• Direct real-time monitoring of membrane-bound PLC activity has been a significant challenge.

Purpose of the Study:

• To develop a novel method for real-time measurement of phospholipase C (PLC) activity.
• To introduce XY-69, a fluorogenic reporter for selective PLC activity detection.
• To enable high-throughput screening for PLC inhibitors.

Main Methods:

• Development of XY-69, a membrane-preferring fluorogenic reporter.
• Assaying purified PLC enzymes and cellular lysates using XY-69.
• Validation of XY-69 in reporting Gαq-mediated PLC-β3 activation.

Main Results:

• XY-69 selectively partitions into membranes, enabling real-time PLC activity measurement.
• The reporter accurately reflects membrane-dependent PLC activation.
• XY-69 offers an alternative to radioactive substrates in conventional PLC assays.

Conclusions:

• XY-69 provides a valuable tool for studying PLC activity in biochemical and cellular contexts.
• This reporter facilitates high-throughput screening for novel PLC inhibitors.
• Future development of cell-permeable XY-69 variants could enable live-cell imaging of PLC activation.