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Visualization and molecular analysis of nuclear import of protein kinase CK2 subunits in living cells

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Abstract

We have generated fusion proteins between the subunits of CK2 and GFP and characterized their behaviour in living cells. The expressed fusion proteins were functional and interacted with endogenous CK2. Imaging of NIH3T3 cells expressing low level of GFP-CK2α or GFP-CK2β showed that both proteins were mostly nuclear in interphase. Both CK2 subunits contain nuclear localization domains that target them independently to the nucleus. Once in the nucleus, both subunits diffused rapidly in the nucleoplasm. In mitotic cells, CK2 subunits were dispersed throughout the cytoplasm and were not associated to chromatin. Our data are compatible with the idea that each subunit can translocate individually to the nucleus to interact with each other or with important cellular partners. Understanding the molecular mechanisms which regulate the dynamic localization of CK2 subunits will be of central importance.

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Authors and Affiliations

  1. INSERM EMI 0104/BRCE, DBMS, CEA, Grenoble, France

    Véronique Martel, Odile Filhol, Delphine Gerber & Claude Cochet

  2. Almirall Prodesfarma SA, Centro de Investigation, Barcelona, Spain

    Arsenio Nueda

  3. Departamento de Quimica Fisica Aplicada, Universidad Autonoma de Madrid, Madrid, Spain

    Maria Jose Benitez

Authors
  1. Véronique Martel
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  2. Odile Filhol
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  3. Arsenio Nueda
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  4. Delphine Gerber
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  5. Maria Jose Benitez
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  6. Claude Cochet
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Martel, V., Filhol, O., Nueda, A. et al. Visualization and molecular analysis of nuclear import of protein kinase CK2 subunits in living cells. Mol Cell Biochem 227, 81–90 (2001). https://doi.org/10.1023/A:1013181427390

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