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Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach
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Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach

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Inhibitory influence of natural flavonoids on human protein kinase CK2 isoforms: effect of the regulatory subunit

Andrea Baier1, Jolanta Nazaruk2, Anna Galicka3

  • 1Department of Molecular Biology, The John Paul II Catholic University of Lublin, ul. Konstantynow 1i, 20-708, Lublin, Poland. baier@kul.pl.

Molecular and Cellular Biochemistry
|December 1, 2017
PubMed

Insights

Natural flavonoids were screened for their ability to inhibit the protein kinase CK2. Some flavonoids selectively inhibited CK2α

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Casein kinase 2 (CK2) is a crucial protein kinase involved in numerous cellular processes.
  • CK2 exists as a tetrameric holoenzyme (CK2α₂β₂ or CK2α'₂β₂) or as free catalytic subunits.
  • Dysregulation of CK2 activity is implicated in various diseases, making it a therapeutic target.

Purpose of the Study:

  • To identify natural flavonoids that inhibit CK2 holoenzymes and/or catalytic subunits.
  • To investigate the selectivity of flavonoid inhibition towards different CK2 isoforms (CK2α vs. CK2α').

Main Methods:

  • In vitro kinase assays were performed to evaluate the inhibitory effects of natural flavonoids.
  • Assays were conducted using purified CK2 holoenzymes (CK2α₂β₂ and CK2α'₂β₂) and free catalytic subunits.
  • Inhibitory concentrations (IC₅₀ values) were determined for selected compounds.

Main Results:

  • Several natural flavonoids demonstrated inhibitory activity against CK2 holoenzymes.
  • A subset of compounds exhibited selective inhibition of the CK2α' catalytic subunit.
  • Specific flavonoids, including chrysoeriol, pedalitin, apigenin, and luteolin, preferentially inhibited the holoenzyme over the free catalytic subunit.
  • A luteolin derivative showed potent inhibition of CK2α' (IC₅₀ = 0.8 μM) but weaker inhibition of the holoenzyme (IC₅₀ = 9.5 μM).

Conclusions:

  • Natural flavonoids represent a promising source of CK2 inhibitors.
  • Flavonoids can display differential inhibition profiles towards CK2 holoenzymes and catalytic subunits.
  • The observed selectivity suggests potential for developing targeted CK2-based therapies.
Keywords:
CK2 holoenzymesFlavonoidsInhibitorsPhosphorylation

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