Abstract
Initiation of DNA replication is regulated by cyclin-dependent protein kinase 2 (Cdk2) in association with two different regulatory subunits, cyclin A and cyclin E (reviewed in ref. 1). But why two different cyclins are required and why their order of activation is tightly regulated are unknown. Using a cell-free system for initiation of DNA replication that is based on G1 nuclei, G1 cytosol and recombinant proteins, we find that cyclins E and A have specialized roles during the transition from G0 to S phase. Cyclin E stimulates replication complex assembly by cooperating with Cdc6, to make G1 nuclei competent to replicate in vitro. Cyclin A has two separable functions: it activates DNA synthesis by replication complexes that are already assembled, and it inhibits the assembly of new complexes. Thus, cyclin E opens a 'window of opportunity' for replication complex assembly that is closed by cyclin A. The dual functions of cyclin A ensure that the assembly phase (G1) ends before DNA synthesis (S) begins, thereby preventing re-initiation until the next cell cycle.
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Acknowledgements
We thank S. Trewick for help with Fig. 1a; T. Bradbeer for GST–cyclin-A expression vector; N. Hanlon for GST–Cdk2/GST–Cak1 co-expression vector; J. Ainscough, L. Ko-Ferrigno and M. Madine for critically reading the manuscript; and N. Jones for advice and support. This work was supported by Cancer Research UK, the Lister Institute of Preventive Medicine, the Medical Research Council and the Louis Jeantet Foundation.
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Coverley, D., Laman, H. & Laskey, R. Distinct roles for cyclins E and A during DNA replication complex assembly and activation. Nat Cell Biol 4, 523–528 (2002). https://doi.org/10.1038/ncb813
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DOI: https://doi.org/10.1038/ncb813
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