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Real-Time Monitoring of Aurora kinase A Activation using Conformational FRET Biosensors in Live Cells
Published on: July 30, 2020
A fluorescence resonance energy transfer activation sensor for Arf6
Brian Hall1, Mark A McLean, Kathryn Davis
1Robert M. Berne Cardiovascular Research Center, University of Virginia, Charlottesville, VA 22908, USA.
Analytical Biochemistry
|December 29, 2007
Summary
Researchers developed a novel method to visualize Arf6 GTPase activation in cells. This technique allows for real-time monitoring of Arf6 activity, crucial for understanding cell migration and cancer progression.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Small GTPases, like Arf6, regulate crucial cellular processes including migration and cancer invasiveness.
- Spatially and temporally regulated activation of Arf6 is essential for its function.
- Existing methods for imaging GTPase activation using FRET have limitations, particularly for Arf6 due to its N-terminal membrane-targeting domain.
Purpose of the Study:
- To develop a novel FRET-based probe for imaging Arf6 activation in real-time within intact cells.
- To overcome the limitations of modifying Arf6 at its N-terminus for fluorescent protein fusion.
- To validate the functionality and membrane localization of the engineered Arf6 probe.
Main Methods:
- Engineered a fluorescent protein fusion probe by inserting a fluorescent protein into an inert loop of Arf6.
- Utilized CyPET/YPET fluorescent proteins as a FRET donor/acceptor pair.
- Assessed membrane targeting, effector interaction (GGA3), and regulation by GAP/GEF.
- Measured FRET signals in fibroblasts stimulated with platelet-derived growth factor (PDGF).
Main Results:
- The engineered Arf6-CyPET probe demonstrated normal membrane targeting and interaction with the effector GGA3.
- The probe was correctly regulated by GTPase-activating protein (GAP) and guanine nucleotide exchange factor (GEF).
- Platelet-derived growth factor (PDGF) stimulation induced a rapid, transient increase in FRET, indicating Arf6 activation in intact cells.
Conclusions:
- A novel, functional FRET probe for Arf6 has been successfully developed.
- This probe enables real-time imaging of Arf6 activation in response to external stimuli.
- The developed reagents provide a valuable tool for investigating Arf6 function in cellular processes and disease states.
