MCM2 is one of the highly conserved mini-chromosome maintenance proteins (MCM) that are involved in the initiation of eukaryotic genome replication. The hexameric protein complex formed by MCM proteins is a key component of the pre-replication complex (pre-RC) and may be involved in the formation of replication forks and in the recruitment of other DNA replication related proteins. MCM2 forms a complex with MCM4, 6, and 7, and has been shown to regulate the helicase activity of the complex. MCM2 is phosphorylated, and thus regulated by protein kinases CDC2 and CDC7.