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Updated: Jan 2, 2026

Real-Time Monitoring of Aurora kinase A Activation using Conformational FRET Biosensors in Live Cells
Published on: July 30, 2020
Cdc7 kinase stimulates Aurora B kinase in M-phase
Sayuri Ito1, Hidemasa Goto2, Kinue Kuniyasu3
1Department of Genome Medicine, Tokyo Metropolitan Institute of Medical Science, Tokyo, 156-8506, Japan.
The cell division cycle 7 (Cdc7) kinase activates Aurora B kinase, promoting M-phase progression and the spindle assembly checkpoint. Cdc7 inhibition reverses mitotic arrest, highlighting its role in cell cycle regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Cdc7 is a serine-threonine kinase essential for DNA replication initiation.
- Aurora B is a mitotic kinase activated during M-phase within the chromosome passenger complex.
- Both kinases are crucial for cell cycle progression.
Purpose of the Study:
- To investigate the regulatory relationship between Cdc7 and Aurora B kinase.
- To determine Cdc7's role in M-phase progression and the spindle assembly checkpoint.
Main Methods:
- In vitro kinase assays to assess Cdc7's effect on Aurora B activity.
- Identification of Aurora B phosphorylation sites using mutagenesis.
- In vivo studies involving Cdc7 downregulation/inhibition and assessment of Aurora B activity and M-phase progression.
- Analysis of the spindle assembly checkpoint (SAC) under Cdc7 inhibition.
Main Results:
- Cdc7 directly phosphorylates and stimulates Aurora B kinase activity in vitro.
- Threonine residues 232 and 236 on Aurora B are critical for its kinase activity, with T236 being a potential Cdc7 target site.
- Cdc7 inhibition or downregulation reduces Aurora B activity in vivo, leading to delayed M-phase progression.
- Cdc7 inhibition reverses paclitaxel-induced mitotic arrest, mimicking the effect of Aurora B inhibition.
Conclusions:
- Cdc7 plays a significant role in M-phase progression and spindle assembly checkpoint regulation.
- Cdc7 likely exerts its effects on M-phase and SAC through the activation of Aurora B kinase.
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