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    Mol Cell. 2009 Jul 31;35(2):206-16.

    Phosphorylation of Mcm2 by Cdc7 promotes pre-replication complex assembly during cell-cycle re-entry.

    Chuang LC, Teixeira LK, Wohlschlegel JA, Henze M, Yates JR, Méndez J, Reed SI.

    Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

    Cyclin E has been shown to have a role in pre-replication complex (Pre-RC) assembly in cells re-entering the cell cycle from quiescence. The assembly of the pre-RC, which involves the loading of six MCM subunits (Mcm2-7), is a prerequisite for DNA replication. We found that cyclin E, through activation of Cdk2, promotes Mcm2 loading onto chromatin. This function is mediated in part by promoting the accumulation of Cdc7 messenger RNA and protein, which then phosphorylates Mcm2. Consistent with this, a phosphomimetic mutant of Mcm2 can bypass the requirement for Cdc7 in terms of Mcm2 loading. Furthermore, ectopic expression of both Cdc6 and Cdc7 can rescue the MCM loading defect associated with expression of dominant-negative Cdk2. These results are consistent with a role for cyclin E-Cdk2 in promoting the accumulation of Cdc6 and Cdc7, which is required for Mcm2 loading when cells re-enter the cell cycle from quiescence.

    PMID: 19647517 [PubMed - indexed for MEDLINE]

    PMCID: 2725784

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