ID   2.1.1.254
DE   erythromycin 3''-O-methyltransferase.
CA   (1) erythromycin C + S-adenosyl-L-methionine = erythromycin A + H(+) +
CA   S-adenosyl-L-homocysteine.
CA   (2) erythromycin D + S-adenosyl-L-methionine = erythromycin B + H(+) +
CA   S-adenosyl-L-homocysteine.
CC   -!- The enzyme methylates the 3 position of the mycarosyl moiety of
CC       erythromycin C, forming the most active form of the antibiotic,
CC       erythromycin A.
CC   -!- It can also methylate the precursor erythromycin D, forming
CC       erythromycin B, which is then converted to erythromycin A by
CC       EC 1.14.13.154.
DR   A4F7P5, ERYG_SACEN ;
//