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Development and exploitation of CK2 inhibitors

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Abstract

A number of quite specific and fairly potent inhibitors of protein kinase CK2, belonging to the classes of condensed polyphenolic compounds, tetrabromobenzimidazole/triazole derivatives and indoloquinazolines are available to date. The structural basis for their selectivity is provided by a hydrophobic pocket adjacent to the ATP/GTP binding site, which in CK2 is smaller than in the majority of other protein kinases due to the presence of a number of residues whose bulky side chains are generally replaced by smaller ones. Consequently a doubly substituted CK2 mutant V66A,I174A is much less sensitive than CK2 wild type to these classes of inhibitors. The most efficient inhibitors both in terms of potency and selectivity are 4,5,6,7-tetrabromo-1H-benzotriazole, TBB (Ki = 0.4 μM), the TBB derivative 2-dimethylamino-4,5,6,7-tetrabromo-1H-benzimidazole, DMAT (Ki = 0.040 μM), the emodin related coumarinic compound 8-hydroxy-4-methyl-9-nitrobenzo[g]chromen-2-one, NBC (Ki = 0.22 μM) and the indoloquinazoline derivative ([5-oxo-5,6-dihydroindolo-(1,2a)quinazolin-7-yl]acetic acid), IQA (Ki = 0.17 μM). These inhibitors are cell permeable as judged from ability to block CK2 in living cells and they have been successfully employed, either alone or in combination with CK2 mutants refractory to inhibition, to dissect signaling pathways affected by CK2 and to identify the endogenous substrates of this pleitropic kinase. By blocking CK2 these inhibitors display a remarkable pro-apoptotic efficacy on a number of tumor derived cell lines, a property which can be exploited in perspective to develop antineoplastic drugs.

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Authors and Affiliations

  1. Dipartimento di Chimica Biologica, Universita’ di Padova, Padova, Italy

    Stefania Sarno, Maria Ruzzene, Mario A. Pagano, Flavio Meggio, Marco Mazzorana, Giovanni Di Maira & Lorenzo A. Pinna

  2. Istituto Veneto di Medicina Molecolare (VIMM), Universita’ di Padova, Padova, Italy

    Stefania Sarno, Maria Ruzzene, Marco Mazzorana, Giovanni Di Maira & Lorenzo A. Pinna

  3. Dipartimento di Scienze Ambientali, Universita’ di Venezia “Ca’ Foscari”, Venezia, Italy

    Pietrogiulio Frascella, Alfonso Zambon & Vittorio Lucchini

  4. Department of Biological Chemistry, University of Padova, Viale G. Colombo 3, 35129, Padova, Italy

    Lorenzo A. Pinna

Authors
  1. Stefania Sarno
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  2. Maria Ruzzene
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  3. Pietrogiulio Frascella
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  4. Mario A. Pagano
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  5. Flavio Meggio
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  7. Marco Mazzorana
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  9. Vittorio Lucchini
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  10. Lorenzo A. Pinna
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Correspondence to Lorenzo A. Pinna.

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Sarno, S., Ruzzene, M., Frascella, P. et al. Development and exploitation of CK2 inhibitors. Mol Cell Biochem 274, 69–76 (2005). https://doi.org/10.1007/s11010-005-3079-z

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  • DOI: https://doi.org/10.1007/s11010-005-3079-z

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