A Chemoenzymatic Strategy for Imaging Cellular Phosphatidic Acid Synthesis

Area of Science:

• Cell Biology
• Biochemistry
• Chemical Biology

Background:

• Phosphatidic acid (PA) is a crucial lipid messenger regulating cellular processes.
• Existing methods for PA detection lack spatial resolution, limiting understanding of its synthesis.
• Subcellular localization of PA synthesis is key to its signaling functions.

Purpose of the Study:

• To develop a novel chemoenzymatic method for imaging cellular PA synthesis sites.
• To visualize and quantify PA production in real-time within living cells.
• To identify intracellular locations of phospholipase D (PLD)-mediated PA synthesis.

Main Methods:

• Utilized phospholipase D (PLD) enzymes for phospholipid head-group exchange with alkynols.
• Generated alkyne-labeled PA analogues within cells.
• Employed Cu-catalyzed azide-alkyne cycloaddition for fluorophore conjugation.
• Enabled visualization via fluorescence microscopy and quantification via HPLC.

Main Results:

• Successfully visualized intracellular sites of PA synthesis mediated by PLD.
• Demonstrated the capability to label and detect PA analogues in situ.
• Provided spatial information on PA production within cellular compartments.

Conclusions:

• The developed chemoenzymatic strategy enables direct imaging of cellular PA synthesis.
• This approach offers new avenues for studying PA-dependent signaling pathways.
• Potential applications include disease imaging and functional remodeling of cellular membranes.