Enables single-stranded DNA binding activity. Contributes to DNA helicase activity. Acts upstream of or within DNA unwinding involved in DNA replication. Predicted to be located in nucleoplasm. Predicted to be part of MCM complex. Predicted to be active in nucleus. Is expressed in several structures, including brain; future brain; limb; metanephros; and myocardium layer. Human ortholog(s) of this gene implicated in immunodeficiency 54. Orthologous to human MCM4 (minichromosome maintenance complex component 4). [provided by Alliance of Genome Resources, Apr 2022]