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Monitoring Kinase and Phosphatase Activities Through the Cell Cycle by Ratiometric FRET
13:38

Monitoring Kinase and Phosphatase Activities Through the Cell Cycle by Ratiometric FRET

Published on: January 27, 2012

Cell cycle dependent regulation of the protein kinase TTK

D Hogg1, C Guidos, D Bailey

  • 1Toronto Hospital, Ontario, Canada.

Oncogene
|January 1, 1994
PubMed

Insights

The TTK protein kinase is present in proliferating human cells. Its expression and activity increase during the cell cycle, peaking in G2/M, suggesting a role in cell cycle control.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • TTK (also known as Monopolar spindle 1 or MPS1) is a protein kinase.
  • TTK expression is linked to cell proliferation, being reduced in resting cells.
  • The precise role of TTK in cell cycle regulation requires further investigation.

Purpose of the Study:

  • To investigate the regulation of TTK protein kinase during the cell cycle.
  • To understand the correlation between TTK gene expression, protein levels, and kinase activity throughout cell cycle transit.

Main Methods:

  • Analysis of TTK mRNA and protein levels in starved and proliferating human cells.
  • Measurement of TTK kinase activity during different phases of the cell cycle.
  • Cell cycle synchronization and induction methods were employed.

Main Results:

  • TTK mRNA, protein, and kinase activity are low in quiescent (starved) cells.
  • Upon cell cycle entry, TTK mRNA, protein, and activity increase, peaking in the G2/M phase.
  • While TTK mRNA and kinase activity decrease sharply in early G1, protein levels remain elevated.

Conclusions:

  • TTK expression and activity are tightly regulated during the cell cycle.
  • The observed cell cycle-dependent regulation suggests TTK plays a significant role in cell cycle control.
  • Further studies are warranted to elucidate the specific mechanisms and functions of TTK in cell division.

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