Minichromosome maintenance complex component 2 (MCM2)

Minichromosome maintenance complex component 2 (MCM2) is an essential, highly conserved protein that forms a core part of the hexameric MCM2–7 complex, which functions as the eukaryotic replicative DNA helicase. This complex is crucial for both the initiation and elongation phases of DNA replication, controlling the licensing of replication origins and ensuring that each region of the genome is replicated only once per cell cycle. MCM2 not only participates in DNA unwinding but also acts as a histone chaperone, binding histone H3–H4 complexes and aiding nucleosome disassembly and reassembly during replication fork progression. Activity and chromatin association of MCM2 are tightly regulated by phosphorylation via cell-cycle kinases such as CDC7 and CDKs. Dysregulation or overexpression of MCM2 is associated with genomic instability and a variety of cancers, in which its expression level serves as a marker for cell proliferation and as a diagnostic/prognostic biomarker. Mouse and in vitro studies suggest that MCM2 also contributes to transcriptional elongation by RNA polymerase II. Because of its critical roles in proliferation and genome integrity, MCM2 and the MCM complex as a whole have drawn interest as potential anticancer therapeutic targets and biomarkers[1][2][3][4][5][7].

Other names

DNA replication licensing factor MCM2BM28CCNL1CDCL1KIAA0030D3S3194DFNA70cdc19mitotinminichromosome maintenance protein 2 homolognuclear protein BM28cell division cycle-like 1cyclin-like 1minichromosome maintenance deficient 2 (mitotin)

Inhibition of MCM2/MCM2-7 complex disrupts the initiation and progression of DNA replication, leading to cell cycle arrest and apoptosis in highly proliferative cells[5][7].