Solid-Phase Synthesis of Fluorescent Probes for Plasma Membrane Labelling

Area of Science:

• Cell Biology
• Biochemistry
• Organic Chemistry

Background:

• The cellular plasma membrane is crucial for cell functions like growth, signaling, and transport.
• Fluorescent probes enable real-time imaging of membrane dynamics but a universal targeting moiety is lacking.

Purpose of the Study:

• To design and synthesize novel stearic acid-based fluorescent probes for plasma membrane imaging.
• To explore variations in probe charge and hydrophobicity for optimal membrane targeting and retention.

Main Methods:

• Solid-phase synthesis of stearic acid-based probes labeled with 6-carboxyfluorescein.
• Development of a gram-scale synthesis for the Fmoc-Lys(6-carboxyfluorescein diacetate)-OH building block.
• Evaluation of probe performance based on plasma membrane brightness and retention.

Main Results:

• Successful fabrication of novel stearic acid-based fluorescent probes.
• Identification of optimal probes featuring a positively charged amino group and a stearic acid tail.
• Demonstrated intense plasma membrane brightness and robust probe retention.

Conclusions:

• The developed probes provide an effective tool for non-invasive, real-time imaging of plasma membrane morphology and dynamics.
• The new probes address the need for improved targeting and anchoring moieties in plasma membrane research.
• The optimized probes exhibit superior performance for cellular imaging applications.