Component of the MCM8-MCM9 complex, a complex involved in homologous recombination repair following DNA interstrand cross-links and plays a key role during gametogenesis. The MCM8-MCM9 complex probably acts as a hexameric helicase required to process aberrant forks into homologous recombination substrates and to orchestrate homologous recombination with resection, fork stabilization and fork restart. ATP + H2O = ADP + H(+) + phosphate Component of the MCM8-MCM9 complex, which forms a hexamer composed of MCM8 and MCM9. Localizes to nuclear foci and colocalizes with RAD51. Belongs to the MCM family.