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Aurora B regulates MCAK at the mitotic centromere
Paul D Andrews1, Yulia Ovechkina, Nick Morrice
1Division of Gene Regulation and Expression, Wellcome Trust Biocentre, University of Dundee, Dow Street, Dundee DD1 5EH, United Kingdom. p.d.andrews@dundee.ac.uk
Developmental Cell
|February 13, 2004
Summary
Aurora B protein kinase regulates mitotic centromere-associated kinesin (MCAK) activity and localization. This regulation is crucial for proper chromosome alignment during cell division, ensuring accurate cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Chromosome alignment and orientation within the mitotic spindle are essential for accurate cell division.
- The Aurora B protein kinase and mitotic centromere-associated kinesin (MCAK) are key regulators of this process.
Purpose of the Study:
- To investigate the regulatory relationship between Aurora B and MCAK.
- To elucidate how Aurora B influences MCAK's activity and localization during mitosis.
Main Methods:
- In vitro kinase assays to assess MCAK's microtubule depolymerizing activity.
- Expression of MCAK phospho-mimic (S/E) and phospho-null (S/A) mutants in vivo.
- Fluorescence Recovery After Photobleaching (FRAP) analysis to study MCAK binding dynamics.
- RNA interference (RNAi) and expression of kinase-dead mutants to disrupt Aurora B function.
Main Results:
- Aurora B inhibits MCAK's microtubule depolymerizing activity in vitro.
- MCAK phosphorylation mutants (S/E and S/A) led to increased syntelic attachments and mono-oriented chromosomes.
- Phosphorylation affects MCAK localization, with S/E mutants at the inner centromere and S/A mutants at kinetochores.
- Disruption of Aurora B function impaired centromeric targeting of MCAK.
Conclusions:
- Aurora B directly regulates MCAK activity and localization.
- This regulation is critical for proper chromosome segregation during mitosis.
- Aurora B controls MCAK's function at both the centromere and kinetochore levels.