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A more recent version of this article appeared on September 1, 2003
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Submitted on February 19, 2003
Revised on May 12, 2003
Accepted on May 19, 2003
1 Department of Zoology, University of Oxford, South Parks Road,
Oxford, OX1 3PS, UK, School of Biological Sciences,
University of Exeter, Washington Singer Laboratories, Perry Road,
Exeter EX4 4QG, UK
* Corresponding author. E-mail address: stephen.kearsey{at}zoo.ox.ac.uk.
Using a cytological assay to monitor the successive chromatin association of replication proteins leading to replication initiation, we have investigated the function of fission yeast Cdc23/Mcm10 in DNA replication. Inactivation of Cdc23 before replication initiation using tight degron mutations has no effect on Mcm2 chromatin association, and thus prereplicative complex (preRC) formation, although Cdc45 chromatin binding is blocked. Inactivating Cdc23 during an S phase block after Cdc45 has bound causes a small reduction in Cdc45 chromatin binding, and replication does not terminate in the absence of Mcm10 function. These observations show that Cdc23/Mcm10 function is conserved between fission yeast and Xenopus, where in vitro analysis has indicated a similar requirement for Cdc45 binding, but apparently not compared with S. cerevisiae, where Mcm10 is needed for Mcm2 chromatin binding. However, unlike the situation in Xenopus, where Mcm10 chromatin binding is dependent on Mcm2-7, we show that the fission yeast protein is bound to chromatin throughout the cell cycle in growing cells, and only displaced from chromatin during quiescence. On return to growth, Cdc23 chromatin binding is rapidly reestablished independently from preRC formation, suggesting that chromatin association of Cdc23 provides a link between proliferation and competence to execute DNA replication.
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