Related Experiment Video
Updated: Feb 5, 2026
13:38
Monitoring Kinase and Phosphatase Activities Through the Cell Cycle by Ratiometric FRET
Published on: January 27, 2012
14.7K
Visualizing PINK1 Activity Dynamics in Single Cells with a Phase Separation-Based Kinase Activity Reporter.
Katie G Vineall1, Alexia Andrikopoulos1, Michael J Sun1
1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States.
ACS Sensors
|February 3, 2026
Summary
Researchers developed a novel biosensor, PINK1-SPARK, to track the activity of Phosphatase and tensin homologue-induced kinase 1 (PINK1) in real-time within single cells. This tool illuminates PINK1 dynamics and heterogeneity, advancing studies on mitophagy and cellular energy regulation.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Phosphatase and tensin homologue-induced kinase 1 (PINK1) is crucial for mitophagy, cell death, and cellular bioenergetics.
- Existing bulk methods for studying PINK1 activity provide limited temporal resolution and miss cell-to-cell variations.
Purpose of the Study:
- To develop a novel biosensor for real-time monitoring of PINK1 kinase activity in single live cells.
- To overcome limitations of bulk assays and characterize PINK1 activity dynamics and heterogeneity.
Main Methods:
- Developed a phase separation-based PINK1 biosensor (PINK1-SPARK) utilizing the SPARK design.
- Utilized PINK1-SPARK to observe real-time PINK1 activity in response to mitochondrial depolarization and pharmacological activation.
- Created a HaloTag-based PINK1-SPARK for multiplexed imaging with mitochondrial damage markers.
Main Results:
- Successfully visualized real-time PINK1 kinase activity in single cells.
- Demonstrated the ability to track dynamic changes in PINK1 activity under various cellular conditions.
- Enabled simultaneous imaging of PINK1 activity and mitochondrial damage markers.
Conclusions:
- PINK1-SPARK is a novel tool for temporal measurement of PINK1 activity in single live cells.
- This biosensor facilitates deeper understanding of PINK1's role in mitophagy and cellular function.
- The tool allows for detailed characterization of cell-to-cell heterogeneity in PINK1 activity.
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