A screening-compatible live cell fluorescence resonance energy transfer-based assay for modulation of Rho GTPase...

Area of Science:

• Cell Biology
• Biochemistry
• Molecular Biology

Background:

• Rho family GTPases are key regulators of the cytoskeleton.
• Guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs) control Rho GTPase activity.
• Understanding GEF/GAP function is crucial for cell biology research.

Purpose of the Study:

• To present a robust, high-throughput compatible biosensor assay.
• To analyze changes in Rho GTPase activity mediated by GEFs and GAPs.
• To enable semi-quantitative comparison of GEF/GAP function in a native cellular environment.

Main Methods:

• Development of a ratiometric FRET biosensor assay.
• High-throughput compatibility for analyzing Rho GTPase activity.
• Application in the native cellular environment to study GEF/GAP interactions.

Main Results:

• The assay provides a robust workflow for measuring Rho GTPase activity.
• Enables semi-quantitative comparison of guanine nucleotide exchange factor (GEF) and GTPase-activating protein (GAP) function.
• The experimental design is adaptable for other monomolecular ratiometric FRET sensors.

Conclusions:

• The developed biosensor assay is a valuable tool for studying Rho GTPase regulation.
• Facilitates high-throughput screening of GEF and GAP modulators.
• Applicable to a broader range of FRET-based biosensor studies in cell signaling.