Optical manipulation of sphingolipid biosynthesis using photoswitchable ceramides

Area of Science:

• Biochemistry and Molecular Biology
• Cellular Signaling
• Metabolic Engineering

Background:

• Ceramides are crucial sphingolipids involved in cellular stress signaling and apoptosis.
• Current methods lack the spatiotemporal precision needed to study ceramide metabolism and function.
• Precise control over ceramide levels is essential for understanding their biological roles.

Purpose of the Study:

• To develop photoswitchable ceramides (caCers) for optical control over sphingolipid production.
• To investigate the impact of light-induced ceramide packing on metabolic conversion.
• To enable precise, light-driven manipulation of cellular ceramide dynamics.

Main Methods:

• Synthesis of clickable, azobenzene-containing ceramides (caCers).
• Atomic force microscopy on model lipid bilayers to assess caCer packing.
• Metabolic tracing studies in cells to quantify ceramide conversion rates.

Main Results:

• Light-induced changes in caCer lateral packing significantly altered metabolic conversion rates.
• Sphingomyelin synthase and glucosylceramide synthase activities were modulated by light.
• Metabolic rate changes were rapid, reversible, and repeatable over multiple light cycles.

Conclusions:

• caCers provide a novel tool for optically controlling sphingolipid metabolism with spatiotemporal precision.
• This approach allows for the investigation of ceramide and derivative roles in cellular processes.
• Future studies can leverage light-controlled ceramide dynamics to probe complex biological pathways.