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A review of progress towards elucidating the role of protein kinase CK2 in polymerase III transcription: Regulation of the TATA binding protein

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Abstract

We have investigated the molecular basis of the requirement for protein kinase CK2 in nuclear transcription in Saccharomyces cerevisiae. In vivo and in vitro analysis has demonstrated that CK2 is required for efficient transcription of the tRNA and 55 rRNA genes by RNA polymerase III. This suggests that a component of the pol III transcription machinery is regulated by CK2. We tested this possibility by a biochemical complementation approach in which components of the pol III transcription machinery from wild type cells were tested for their ability to rescue transcription in extract from a conditionally CK2-deficient mutant. We found that pol III transcription initiation factor IIIB (TFIIIB) fully restores transcription in CK2-deficient extract. Further in vitro studies revealed that TFIIIB must be phosphorylated to be active, that a single subunit of wild type TFIIIB, the TATA binding protein (TBP), is efficiently phosphorylated by CK2, and that recombinant TBP and a limiting amount of CK2 rescues transcription in CK2-deficient extract. We conclude that TBP is the physiological target of CK2 among the components of the pol III transcription machinery. The implications of this result are discussed in the context of previous data concerning the regulation of TFIIIB.

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Authors and Affiliations

  1. Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada

    Ataollah Ghavidel, Darren J. Hockman & Michael J. Schultz

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  1. Ataollah Ghavidel
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  2. Darren J. Hockman
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  3. Michael J. Schultz
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Ghavidel, A., Hockman, D.J. & Schultz, M.J. A review of progress towards elucidating the role of protein kinase CK2 in polymerase III transcription: Regulation of the TATA binding protein. Mol Cell Biochem 191, 143–148 (1999). https://doi.org/10.1023/A:1006885522221

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