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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Cell cycle regulatory protein p27KIP1 is a substrate and interacts with the protein kinase CK2

Julio C Tapia1, Victor M Bolanos-Garcia, Muhammed Sayed

  • 1Laboratorio de Biología Molecular de la Transducción de Señales Celulares, Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Chile.

Journal of Cellular Biochemistry
|March 23, 2004
PubMed

Insights

Protein kinase CK2 phosphorylates cell cycle regulator p27(KIP1) via its beta subunit, affecting its structure and potentially its function. This interaction is crucial for understanding cell cycle control.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein kinase CK2 (Casein Kinase 2) is a crucial enzyme involved in cell cycle regulation.
  • p27(KIP1) is a key cell cycle regulator and cyclin-dependent kinase (Cdk) inhibitor.

Purpose of the Study:

  • To investigate the relationship between protein kinase CK2 and the cell cycle regulator p27(KIP1).
  • To elucidate the mechanism of p27(KIP1) phosphorylation by CK2.

Main Methods:

  • In vitro kinase assays using recombinant proteins.
  • Pull-down assays and Surface Plasmon Resonance (SPR) for interaction analysis.
  • Circular Dichroism (CD) spectroscopy to assess structural changes.

Main Results:

  • CK2 phosphorylates p27(KIP1) at serine-83, but only in the presence of the CK2 beta subunit.
  • p27(KIP1) interacts with the CK2 beta subunit via its amino and carboxyl termini.
  • Phosphorylation by CK2 alters the secondary structure of p27(KIP1).

Conclusions:

  • CK2 phosphorylation of p27(KIP1) likely involves a docking mechanism mediated by the CK2 beta subunit.
  • This phosphorylation event may modulate the biological activity of p27(KIP1), impacting cell cycle control.

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