MCM3（minichromosome maintenance complex component 3），癌症关联基因，基因ID：4172，该基因编码的蛋白是一种高度保守的小染色体维持蛋白（mcm），参与真核生物基因组复制的启动。MCM蛋白形成的六聚体蛋白复合物是复制前复合物（pre-RC）的关键组成部分，可能参与复制叉的形成和其它DNA复制相关蛋白的募集这种蛋白质是由MCM2-7组成的蛋白质复合物的一个亚单位它已经被证明与MCM5/CDC46直接交互这种蛋白质还与染色质相关的乙酰转移酶MCM3AP相互作用并被其乙酰化这种蛋白质的乙酰化抑制了dna复制和细胞周期进程的开始。已经发现了一些编码不同亚型的转录变体。[由RefSeq提供，2018年10月]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-ass。