ID 2.3.1.238 DE monacolin J acid methylbutanoate transferase. CA monacolin J carboxylate + (S)-2-methylbutanoyl-[2-methylbutanoate CA polyketide synthase] = lovastatin carboxylate + holo-[2-methylbutanoate CA polyketide synthase]. CC -!- The enzyme catalyzes the ultimate reaction in the lovastatin CC biosynthesis pathway of the filamentous fungus Aspergillus terreus. DR Q9Y7D1, LOVD_ASPTE ; Q0C8M0, LOVD_ASPTN ; Q3S2U2, MOKF_MONPI ; //