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A novel Cdk2 interactor is phosphorylated by Cdc7 and associates with components of the replication complexes.

Cell Cycle. 2005 Aug;4(8):1120-6. Epub 2005 Aug 10
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摘要


Initiation of DNA replication in eukaryotic cells depends on the assembly of the prereplication complexes containing two hexamers, the Origin Recognition Complex (ORC) and the Minichromosome Licensing complex (MCM); and on the subsequent conformational changes in the MCM complex leading to the formation of a competent DNA replication complex, firing of the DNA polymerase and disassembly of the MCM. The dynamics of the MCM complex is under the control of two Ser/Thr kinases, the Cell cycle-dependent kinase 2 (Cdk2) and Cell division cycle gene 7 (Cdc7). The precise substrates of the kinases at the origins and the sequence of events leading to the origins firing are not well understood. Using the two hybrid selection in yeast, we have identified a novel gene, the Cdk2 interacting protein, CINP. We show that CINP is a component of the active cyclin E /Cdk2 and cyclin A /Cdk2 complexes. CINP also interacts with Cdc7 and is phopshorylated by Cdc7, but not by Cdk2. We further show that CINP binds to chromatin in a replication-dependent manner, and associates with ORC2-containing complexes and MCM. We propose that CINP is part of the Cdc7-dependent mechanism of origin firing and a functional and physical link between Cdk2 and Cdc7 complexes at the origins.

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