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Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach
11:11

Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach

Published on: February 21, 2019

CK2 enzyme affinity against c-myc 424-434 substrate in human lung cancer tissue

Ilhan Yaylim1, Nazli Ezgi Ozkan, Turgut Isitmangil

  • 1Department of Molecular Medicine, Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey. ilhanyaylim@gmail.com

Asian Pacific Journal of Cancer Prevention : APJCP
|December 19, 2012
PubMed

Insights

Protein kinase CK2 activity was studied in lung cancer. While overall activity was similar, CK2 showed higher affinity for the c-myc substrate in neoplastic tissues, suggesting a role in cancer development.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Protein kinase CK2 (casein kinase 2) is a serine/threonine kinase involved in numerous cellular processes.
  • CK2 is known to be upregulated in various cancers, but its precise role in carcinogenesis remains unclear.
  • The proto-oncogene c-myc, a substrate of CK2, plays a role in both normal development and tumor progression.

Purpose of the Study:

  • To evaluate optimal enzyme and substrate concentrations for CK2 activity in human lung tissues.
  • To compare CK2 activity and substrate affinity in neoplastic versus non-neoplastic lung tissues using a c-myc peptide substrate.
  • To investigate the potential role of CK2-mediated phosphorylation of c-myc in lung cancer.

Main Methods:

  • Enzyme kinetics assays were performed on neoplastic and non-neoplastic human lung tissues.
  • The c-myc 424-434 peptide (EQKLISEEDL) was used as a substrate to measure CK2 activity.
  • Kinetic parameters, including Km values, were determined for CK2 in both tissue types.

Main Results:

  • CK2 activity levels (U/mg protein) were comparable between neoplastic (600-750 U/mg) and non-neoplastic (650-800 U/mg) lung tissues.
  • The Michaelis constant (Km) for the c-myc peptide substrate was significantly lower in neoplastic tissue (0.18 μM) compared to non-neoplastic tissue (0.33 μM), indicating higher substrate affinity.
  • A two-fold higher affinity of CK2 for the c-myc 424-434 peptide was observed in cancer tissue.

Conclusions:

  • Despite similar overall CK2 activity, neoplastic lung tissue exhibits a significantly higher affinity for the c-myc substrate.
  • This increased affinity suggests that CK2-mediated phosphorylation of c-myc may be crucial for its dimerization and regulation in lung cancer.
  • These findings highlight a potential mechanism by which CK2 contributes to tumor development through altered c-myc regulation.

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