Probable component of the MCM2-7 complex (MCM complex) that may function as a DNA helicase and which is essential to undergo a single round of replication initiation and elongation per cell cycle in eukaryotic cells. May play a crucial role in the control of de-differentiation and cell proliferation processes required for lateral root formation. Is essential for embryo development. Is involved in the geminivirus mungbean yellow mosaic virus (MYMV) DNA replication, presumably in conjunction with other host factors. ATP + H2O = ADP + H(+) + phosphate Component of the minichromosome maintenance (MCM) complex, a heterotetramer composed of MCM2, MCM3, MCM4, MCM5, MCM6 and MCM7. Interacts with ETG1 and the replication-associated protein of the geminivirus mungbean yellow mosaic virus (MYMV). A number of isoforms are produced. According to EST sequences. Expressed in root apical meristem, lateral root meristem primordia, leaf primordia, shoot apical meristem and flower buds. Embryonic lethality when homozygous. Over-expression of MCM2 strongly reduces plant and cell sizes and inhibits endoreduplication. Belongs to the MCM family. Sequencing errors.