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16S rRNA (adenine1518-N6/adenine1519-N6)-dimethyltransferase (EC 2.1.1.182, S-adenosylmethionine-6-N',N'-adenosyl (rRNA) dimethyltransferase, KsgA, ksgA methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:16S rRNA (adenine1518-N6/adenine1519-N6)-dimethyltransferase. This enzyme catalyses the following chemical reaction

4 S-adenosyl-L-methionine + adenine1518/adenine1519 in 16S rRNA






{\displaystyle \rightleftharpoons }
4 Ribosomal RNA + N6-dimethyladenine1518/N6-dimethyladenine1519 in 16S rRNAKsgA introduces the dimethylation of adenine1518 and adenine1519 in 16S rRNA. Strains lacking the methylase are resistant to kasugamycin [1].

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