Probably recognizes the double-stranded sequence 5'-CTAT-3' and methylates A-3 on only one strand; as the bacterial DNA is methylated on this sequence and this is the only type II methylase in the genome, it is probably responsible for all of the methylation on this site in the genome. a 2'-deoxyadenosine in DNA + S-adenosyl-L-methionine = an N(6)-methyl-2'-deoxyadenosine in DNA + H(+) + S-adenosyl-L-homocysteine Belongs to the N(4)/N(6)-methyltransferase family.