The MCM3 acetylase MCM3AP inhibits initiation, but not elongation, of DNA replication via interaction with MCM3 - PubMed (original) (raw)

. 2002 Nov 8;277(45):43121-5.

doi: 10.1074/jbc.C200442200. Epub 2002 Sep 10.

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• PMID: 12226073
• DOI: 10.1074/jbc.C200442200

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The MCM3 acetylase MCM3AP inhibits initiation, but not elongation, of DNA replication via interaction with MCM3

Yoshinori Takei et al. J Biol Chem. 2002.

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Abstract

Minichromosome maintenance (MCM) proteins are essential components of pre-replication complexes, which limit DNA replication to once per cell cycle. MCM3 acetylating protein, MCM3AP, binds and acetylates MCM3 and inhibits cell cycle progression. In the present study, we examined inhibition of the cell cycle by MCM3AP in a cell-free system. We show here that wild type MCM3AP, but not the acetylase-deficient mutant, inhibits initiation of DNA replication, but not elongation. Both wild type and acetylase-deficient mutant MCM3AP, however, can bind to chromatin through interaction with MCM3. These results indicate that MCM3 acetylase activity of MCM3AP is required to inhibit initiation of DNA replication and that association of MCM3AP to chromatin alone is not sufficient for the inhibition. We also show that interaction between MCM3 and MCM3AP is essential for nuclear localization and chromatin binding of MCM3AP. Furthermore, the chromatin binding of MCM3AP is temporally correlated with that of endogenous MCM3 when cells were released from mitosis. Hence, MCM3AP is a potent natural inhibitor of the initiation of DNA replication whose action is mediated by interaction with MCM3.

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