MMS22L (Methyl methanesulfonate-sensitivity protein 22-like) is found in yeast, plants and vertebrates, and is integrally concerned with DNA forking and repair mechanisms during replication. MMS22L complexes with TONSL and this complex accumulates at regions of ssDNA associated with distressed replication forks or at processed DNA breaks. Its depletion results in high levels of endogenous DNA double-strand breaks caused by an inability to complete DNA synthesis after replication fork collapse. Thus the complex mediates recovery from replication stress and homologous recombination in vertebrates, yeasts and plants. This family is the more N-terminal region of the proteins.
Jiyao W et al.(2023). "The conserved domain database in 2023.",