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Updated: Apr 27, 2026

Real-Time Monitoring of Aurora kinase A Activation using Conformational FRET Biosensors in Live Cells
Published on: July 30, 2020
RNA stimulates Aurora B kinase activity during mitosis
Ashwini Jambhekar1, Amy B Emerman1, Caterina T H Schweidenback1
1Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts, United States of America; Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America.
RNA regulates the mitotic kinase Aurora-B (AurB) to promote cell division. This study reveals a translation-independent mechanism where RNA binding stimulates AurB activity, crucial for proper spindle assembly and cell viability.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Accurate chromosome segregation during cell division is vital for cell viability.
- The mitotic spindle plays a critical role in chromosome segregation, but its assembly regulation is not fully understood.
- Recent studies suggest RNA influences spindle assembly independently of translation, yet the mechanism remains elusive.
Purpose of the Study:
- To investigate the mechanism by which RNA regulates mitotic spindle assembly.
- To determine RNA's role in the localization and activity of the mitotic kinase Aurora-B (AurB).
Main Methods:
- Analysis of Aurora-B (AurB) localization and kinase activity in ribonucleoprotein (RNP) complexes.
- Experimentation with Xenopus egg extracts treated with RNase.
- In vitro assays to assess RNA binding effects on AurB activity.
- Investigating spindle assembly defects and rescue strategies involving MCAK inhibition.
Main Results:
- RNA was found to regulate both the localization and catalytic activity of Aurora-B (AurB).
- AurB kinase activity decreased in RNase-treated Xenopus egg extracts and was stimulated by RNA binding in vitro.
- Spindle assembly defects caused by RNase treatment were partially rescued by inhibiting MCAK, a microtubule depolymerase regulated by AurB.
Conclusions:
- Aurora-B (AurB) is identified as a key RNA-dependent spindle assembly factor.
- RNA directly stimulates AurB kinase activity in a translation-independent manner.
- This work elucidates a novel mechanism for RNA's role in regulating cell division and spindle formation.
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