ID 1.14.13.154 DE erythromycin 12 hydroxylase. CA erythromycin D + H(+) + NADPH + O2 = erythromycin C + H2O + NADP(+). CC -!- The enzyme is responsible for the C-12 hydroxylation of the CC macrolactone ring, one of the last steps in erythromycin CC biosynthesis. CC -!- It shows 1200-1900-fold preference for erythromycin D over the CC alternative substrate erythromycin B. DR P48635, ERYK_SACEN ; //