Tags: Enzyme.
Erythromycin 3-O-methyltransferase (EC 2.1.1.254 EryG) is an enzyme with system name S-adenosyl-L-methionine:erythromycin C 3-O-methyltransferase. This enzyme catalyses the following chemical reaction (1) S-adenosyl-L-methionine + erythromycin C S-adenosyl-L-homocysteine + erythromycin A (2) S-adenosyl-L-methionine + erythromycin D S-adenosyl-L-homocysteine + erythromycin BThe enzyme methylates the 3 position of the mycarosyl moiety of erythromycin C.