Initiation of Replication
After the pre-RC is formed it must be activated and the replisome assembled in order for DNA replication to occur.
In prokaryotes, DnaA hydrolyzes ATP in order to unwind DNA at the oriC. This denatured region is accessible to the DnaB helicase and DnaC helicase loader. Single-strand binding proteins stabilize the newly formed replication bubble and interact with the DnaG primase. DnaG recruits the replicative DNA polymerase III, and replication begins.
In eukaryotes, MCM heterohexamer is phosphorylated by CDC7 and CDK, which displaces Cdc6 and recruits MCM10. MCM10 cooperates with MCM2-7 in the recruitment of Cdc45. Cdc45 then recruits key components of the replisome; the replicative DNA polymerase α and its primase. DNA replication can then begin.
Read more about this topic: Pre-replication Complex
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