16S rRNA (guanine1405-N7)-methyltransferase (, methyltransferase Sgm, m7G1405 Mtase, Sgm Mtase, Sgm, sisomicin-gentamicin methyltransferase, sisomicin-gentamicin methylase, GrmA, RmtB, RmtC, ArmA) is an enzyme with systematic name S-adenosyl-L-methionine:16S rRNA (guanine1405-N7)-methyltransferase. This enzyme catalyses the following chemical reaction
S-adenosyl-L-methionine + guanine1405 in 16S rRNA S-adenosyl-L-homocysteine + 7-methylguanine1405 in 16S rRNA
The enzyme specifically methylates guanine1405 at N7 in 16S rRNA.
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