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CK2 regulates in vitro the activity of the yeast cyclin-dependent kinase inhibitor Sic1

Barberis, Matteo, Pagano, M.A., De Gioia, L., Marin, O., Vanoni, M., Pinna, L.A. and Alberghina, L. (2005) CK2 regulates in vitro the activity of the yeast cyclin-dependent kinase inhibitor Sic1 Biochemical and Biophysical Research Communications, 336 (4). pp. 1040-1048.

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We have previously demonstrated that the cyclin-dependent kinase inhibitor (Cki) Sic1 of Saccharomyces cerevisiae is phosphorylated in vitro by the CK2 kinase on Ser201 residue. Moreover, we have collected evidence showing that Sic1 is functionally and structurally related to mammalian Cki p27Kip1 and binds to the mammalian Cdk2/cyclin A complex with a similar mode of inhibition. In this paper, we use SPR analysis to investigate the binding of Sic1 to the catatytic and regulatory subunits of CK2. Evidence is presented showing that phosphorylation of Sic1 at the CK2 consensus site QES201EDEED increases the binding of a Sic1-derived peptide to the Cdk2/cyclin A complex, a functional homologue of the yeast Cdk1/Clb5,6. Moreover, Sic1 fully phosphorylated in vitro on Ser201 by CK2 is shown to be a stronger inhibitor of the Cdk/cyclin complexes than the unphosphorylated protein. Taken together, these data disclose the possibility that CK2 plays a role in the regulation of Sic1 activity.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Biosciences and Medicine
Authors :
Pagano, M.A.
De Gioia, L.
Marin, O.
Vanoni, M.
Pinna, L.A.
Alberghina, L.
Date : 8 September 2005
DOI : 10.1016/j.bbrc.2005.08.224
Uncontrolled Keywords : BIAcore; Cell cycle; CK2; Molecular modelling; Phosphorylation; Protein-protein interaction; Sic1
Depositing User : Clive Harris
Date Deposited : 16 Apr 2019 13:50
Last Modified : 16 Apr 2019 13:50

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