Ada protein can repair the damage by transferring methyl groups from O6-methylguanine or O4-methylthymine to Cys321 and also from methylphosphotriesters to Cys69 residue This process is irreversible.
A proteína Ada pode reparar os danos ao transferir grupos metilo da O6-metilguanina ou O4-metiltimina á Cys321 e tamén de metilfosfotriésteres ao residuo Cys69.