MCM3

The protein encoded by this gene 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. This protein is a subunit of the protein complex that consists of MCM2-7. It has been shown to interact directly with MCM5/CDC46. This protein also interacts with and is acetylated by MCM3AP, a chromatin-associated acetyltransferase. The acetylation of this protein inhibits the initiation of DNA replication and cell cycle progression. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2012]

Minichromosome Maintenance Complex Component 3

Acts as component of the MCM2-7 complex (MCM complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the MCM2-7 ring are formed through the interaction surfaces of two neighboring subunits such that a critical structure of a conserved arginine finger motif is provided in trans relative to the ATP-binding site of the Walker A box of the adjacent subunit. The six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity. Required for DNA replication and cell proliferation.

DNA replication initiation Source: ProtInc
DNA strand elongation involved in DNA replication Source: GO_Central
DNA unwinding involved in DNA replication Source: ComplexPortal
Double-strand break repair via break-induced replication Source: GO_Central
Mitotic DNA replication initiation Source: GO_Central
Regulation of DNA-dependent DNA replication initiation Source: ComplexPortal

Nucleus
Other locations
Chromosome
Note: Associated with chromatin before the formation of nuclei and detaches from it as DNA replication progresses.

Acetylated by MCM3AP.
O-glycosylated (O-GlcNAcylated), in a cell cycle-dependent manner.