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Updated: May 4, 2026

Real-Time Monitoring of Aurora kinase A Activation using Conformational FRET Biosensors in Live Cells
Published on: July 30, 2020
Bora and Aurora-A continue to activate Plk1 in mitosis
Wytse Bruinsma1, Libor Macurek, Raimundo Freire
1Department of Medical Oncology and Cancer Genomics Center, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG Utrecht, The Netherlands.
Polo-like kinase-1 (Plk1) activation in mitosis relies on sustained Aurora-A kinase activity, with a fraction of Bora retained to maintain Plk1 phosphorylation. This ensures robust Plk1 activity for cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Polo-like kinase-1 (Plk1) is crucial for cell division.
- Plk1 activation requires phosphorylation at T210, primarily by Aurora-A and Bora during the G2 phase.
Purpose of the Study:
- To investigate how Plk1 activity is sustained in mitosis.
- To elucidate the role of the Bora-Aurora-A complex in maintaining Plk1 activation during mitosis.
Main Methods:
- Western blotting to detect protein levels and phosphorylation.
- Cell cycle analysis.
- Kinase assays.
Main Results:
- The Bora-Aurora-A complex remains the primary activator of Plk1 in mitosis.
- A small amount of Aurora-A activity is sufficient for Plk1 activation.
- A fraction of Bora is retained in mitosis, essential for sustained Plk1 phosphorylation.
- Activated Plk1 maintains its activity even with minimal Bora-Aurora-A complex presence.
Conclusions:
- Plk1 activation by Aurora-A functions as a bistable switch, robust once initiated.
- Retained Bora and minimal Aurora-A activity ensure sustained Plk1 function, critical for mitotic commitment and cell division.
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