Chromatin proteins involved in the initiation of DNA replication

Eukaryotic DNA replication is regulated at least in part by the assembly of initiation proteins onto origins of replication. The origin recognition complex (ORC) is bound to origins throughout most of the cell cycle. Other initiation proteins, such as Cdc6 and the MCM/P1 proteins are assembled onto ORC-containing chromatin during G 1 to define a prereplicative complex. During S phase, these proteins are displaced from chromatin and their reassembly is inhibited by protein-dependent kinases.