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Published on: May 26, 2017
Multisite phosphorylation of Erk5 in mitosis
Elena Díaz-Rodríguez1, Atanasio Pandiella
1Instituto de BiologIa Molecular y Celular del Cáncer, CSIC-Universidad de Salamanca, Campus Miguel de Unamuno, 37007-Salamanca, Spain.
Journal of Cell Science
|August 26, 2010
Summary
A second pathway regulates the MAP kinase Erk5 during mitosis, distinct from the classic MEK5 pathway. This novel pathway, involving CDK1, impacts Erk5
Area of Science:
- Cell Biology
- Molecular Biology
- Signal Transduction
Background:
- Mitogen-activated protein (MAP) kinase Erk5 is crucial for cellular proliferation and mitosis.
- Erk5 is classically activated by dual phosphorylation at its TEY motif via MEK5.
- The regulation of Erk5 during mitosis remains incompletely understood.
Purpose of the Study:
- To identify alternative pathways regulating Erk5 phosphorylation during mitosis.
- To investigate the role of specific kinases in mitotic Erk5 phosphorylation.
- To elucidate the functional consequences of mitotic Erk5 phosphorylation.
Main Methods:
- Utilized CDK1 inhibitor RO3306 to assess its effect on Erk5 phosphorylation.
- Performed co-precipitation assays to examine Erk5 and CDK1 interaction.
- Analyzed Erk5 phosphorylation sites in the C-terminal region.
- Investigated Erk5 subcellular localization and transcriptional activity.
Main Results:
- A novel Erk5 phosphorylation pathway, independent of MEK5, is active in mitotic cells.
- CDK1 activity is essential for maintaining mitotic Erk5 phosphorylation.
- CDK1 directly interacts with Erk5 during mitosis.
- Mitotic phosphorylation occurs at multiple C-terminal sites, influencing Erk5 nuclear transport and transcriptional activity.
Conclusions:
- Discovered a second, MEK5-independent pathway for Erk5 phosphorylation during mitosis.
- CDK1 is a key regulator of this novel mitotic Erk5 phosphorylation pathway.
- Mitotic Erk5 phosphorylation by CDK1 impacts its subcellular localization and function.
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