Enables chromatin binding activity. Acts upstream of or within response to yeast. Predicted to be part of MCM complex. Predicted to be active in nucleus. Is expressed in digestive system; nervous system; otic vesicle; pectoral fin; and proliferative region. Human ortholog(s) of this gene implicated in immunodeficiency 54. Orthologous to human MCM4 (minichromosome maintenance complex component 4).