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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
08:33

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

Published on: December 5, 2017

Tumour suppressor CYLD is a negative regulator of the mitotic kinase Aurora-B

Lei Sun1, Jinmin Gao, Lihong Huo

  • 1Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, Tianjin, People's Republic of China.

The Journal of Pathology
|July 2, 2010
PubMed

Insights

The cylindromatosis tumour suppressor CYLD interacts with Aurora-B kinase, inhibiting its activity. This regulation occurs via protein phosphatase 2A (PP2A), independent of CYLD

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Familial cylindromatosis is linked to the CYLD tumour suppressor.
  • CYLD's deubiquitinase activity inhibits cell survival and proliferation.
  • The role of CYLD in regulating mitotic kinases is not fully understood.

Purpose of the Study:

  • To investigate the interaction between CYLD and Aurora-B kinase.
  • To elucidate the mechanism by which CYLD regulates Aurora-B activity.
  • To determine the functional significance of CYLD mutations in this process.

Main Methods:

  • Co-immunoprecipitation assays to detect protein interactions.
  • In vitro kinase assays to measure Aurora-B activity.
  • Site-directed mutagenesis to identify key domains involved in interaction.

Main Results:

  • CYLD directly interacts with Aurora-B kinase via its third CAP-Gly domain.
  • CYLD suppresses Aurora-B activity independently of its deubiquitinase function.
  • CYLD promotes the interaction between Aurora-B and protein phosphatase 2A (PP2A), leading to Aurora-B dephosphorylation.
  • Cylindromatosis-associated CYLD mutations disrupt these interactions and regulatory functions.

Conclusions:

  • CYLD negatively regulates Aurora-B activity through a novel axis involving PP2A.
  • This interaction is crucial for CYLD's tumour-suppressive function.
  • Disruption of the CYLD-PP2A-Aurora-B pathway contributes to cylindromatosis pathogenesis.

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