KsgA introduces the most highly conserved ribosomal RNA modification, the dimethylation of adenine1518 and adenine1519 in 16S rRNA. Strains lacking the methylase are resistant to kasugamycin [1].
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4 S-adenosyl-L-methionine + adenine(1518)/adenine(1519) in 16S rRNA = 4 S-adenosyl-L-homocysteine + N(6)-dimethyladenine(1518)/N(6)- dimethyladenine(1519) in 16S rRNA.