DNA-3-methyladenine glycosylase activity obsolete DNA-3-methyladenine glycosylase IV activity true This term was made obsolete because it represents an enzyme with four different activities. GO:0043736 molecular_function Mpg II DNA-3-methyladenine glycosylase IV activity OBSOLETE. Catalysis of the hydrolysis of alkylated DNA; recognizes and removes both N-3- and N-7-methyl purines by cleaving the N-C1' glycosidic bond between the target damaged DNA base and the deoxyribose sugar. The reaction releases a free base and leaves an apurinic (AP) site. MpgII DNA-7-methylguanine glycosylase activity DNA-7-methyladenine glycosylase activity DNA-3-methylguanine glycosylase activity