Abstract
In eukaryotic cells, the cell-division cycle (CDC)-6 protein is essential to promote the assembly of pre-replicative complexes in the early G1 phase of the cell cycle, a process requiring tight regulation to ensure that proper origin licensing occurs once per cell cycle. Here we show that, in late G1 and early S phase, CDC6 is found in a complex also containing Cyclin A, cyclin-dependent kinase (CDK)-2 and the acetyltransferase general control nonderepressible 5 (GCN5). GCN5 specifically acetylates CDC6 at three lysine residues flanking its cyclin-docking motif, and this modification is crucial for the subsequent phosphorylation of the protein by Cyclin A–CDKs at a specific residue close to the acetylation site. GCN5-mediated acetylation and site-specific phosphorylation of CDC6 are both necessary for the relocalization of the protein to the cell cytoplasm in the S phase, as well as to regulate its stability. This two-step, intramolecular regulatory program by sequential modification of CDC6 seems to be essential for proper S-phase progression.
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Acknowledgements
This work was supported by grants from the FIRB program of the “Ministero dell'Istruzione, Universita' e Ricerca,” Italy and from the “Fondazione CRTrieste” of Trieste, Italy. The authors are indebted to H. Masai (Tokyo Metropolitan Institute of Medical Science) for helpful discussion and to A. Dutta (University of Virginia), K. Helin (Biotech Research and Innovation Centre and Centre for Epigenetics), M. Benkirane (Institut de G–énétique Humaine), J. Pines (Wellcome Trust/Cancer Research UK Gurdon Institute) and H. Masai for the gift of reagents. The authors are grateful to V. Liverani for excellent technical support and to S. Kerbavcic for superb editorial assistance.
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All experiments were performed by R.P. and R.M.-M.; A.C. took part in the design of the initial CDC6 acetylation experiments; M.G. supervised the work and wrote the manuscript.
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Paolinelli, R., Mendoza-Maldonado, R., Cereseto, A. et al. Acetylation by GCN5 regulates CDC6 phosphorylation in the S phase of the cell cycle. Nat Struct Mol Biol 16, 412–420 (2009). https://doi.org/10.1038/nsmb.1583
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DOI: https://doi.org/10.1038/nsmb.1583
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