6-O-methyl-2'-deoxyguanosine in DNA + L-cysteinyl-[protein] --> 2'-deoxyguanosine in DNA + S-methyl-L-cysteinyl-[protein] (according to UniProt)

4-O-methyl-thymidine in DNA + L-cysteinyl-[protein] --> thymidine in DNA + S-methyl-L-cysteinyl-[protein] (according to UniProt)

DNA (containing 6-O-methylguanine) + protein L-cysteine = DNA (without 6-O-methylguanine) + protein S-methyl-L-cysteine (according to Swiss-Prot)