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Phosphorylation of human Fen1 by cyclin-dependent kinase modulates its role in replication fork regulation.

Oncogene | Jul 10, 2003

http://www.ncbi.nlm.nih.gov/pubmed/12853968

Cyclin-dependent kinase (Cdk) Cdk1-Cyclin A can phosphorylate Flap endonuclease 1 (Fen1), a key-enzyme of the DNA replication machinery, in late S phase. Cdk1-cyclin A forms a complex in vitro and in vivo with Fen1. Furthermore, Fen1 phosphorylation is detected in vivo and depends upon Cdks activity. As a functional consequence of phosphorylation by Cdk1-Cyclin A in vitro, endo- and exonuclease activities of Fen1 are reduced whereas its DNA binding is not affected. Moreover, phosphorylation of Fen1 by Cdk1-Cyclin A abrogates its proliferating cell nuclear antigen (PCNA) binding thus preventing stimulation of Fen1 by PCNA. Concomitantly, human cells expressing the S187A mutant defective for Cdk1-Cyclin A phosphorylation accumulate in S phase consistent with a failure in cell cycle regulation through DNA replication. Our results suggest a novel regulatory role of Cdks onto the end of S phase by targeting directly a key enzyme involved in DNA replication.

Pubmed ID: 12853968 RIS Download

Mesh terms: Adenosine Triphosphate | CDC2 Protein Kinase | CDC2-CDC28 Kinases | Cyclin A | Cyclin-Dependent Kinase 2 | Cyclin-Dependent Kinases | DNA | DNA Replication | Endodeoxyribonucleases | Flap Endonucleases | HeLa Cells | Humans | Phosphorylation | Proliferating Cell Nuclear Antigen | Protein-Serine-Threonine Kinases | S Phase

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