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- Title
The replication factory targeting sequence/PCNA-binding site is required in G(1) to control the phosphorylation status of DNA ligase I.
- Authors
Rossi, R; Villa, A; Negri, C; Scovassi, I; Ciarrocchi, G; Biamonti, G; Montecucco, A
- Abstract
The recruitment of DNA ligase I to replication foci in S phase depends on a replication factory targeting sequence that also mediates the interaction with proliferating cell nuclear antigen (PCNA) in vitro. By exploiting a monoclonal antibody directed at a phospho-epitope, we demonstrate that Ser66 of DNA ligase I, which is part of a strong CKII consensus site, is phosphorylated in a cell cycle-dependent manner. After dephosphorylation in early G(1), the level of Ser66 phosphorylation is minimal in G(1), increases progressively in S and peaks in G(2)/M phase. The analysis of epitope-tagged DNA ligase I mutants demonstrates that dephosphorylation of Ser66 requires both the nuclear localization and the PCNA-binding site of the enzyme. Finally, we show that DNA ligase I and PCNA interact in vivo in G(1) and S phase but not in G(2)/M. We propose that dephosphorylation of Ser66 is part of a novel control mechanism to establish the pre-replicative form of DNA ligase I.
- Publication
The EMBO journal, 1999, Vol 18, Issue 20, p5745
- ISSN
0261-4189
- Publication type
Journal Article
- DOI
10.1093/emboj/18.20.5745