ID 2.3.1.244 DE 2-methylbutanoate polyketide synthase. CA holo-[2-methylbutanoate polyketide synthase] + 2 malonyl-CoA + CA S-adenosyl-L-methionine + 2 NADPH + 3 H(+) = (S)-2-methylbutanoyl- CA [2-methylbutanoate polyketide synthase] + S-adenosyl-L-homocysteine + CA 2 CO2 + 2 NADP(+) + 2 CoA + H2O. CC -!- This polyketide synthase enzyme forms the (S)-2-methylbutanoate side CC chain during lovastatin biosynthesis by the filamentous fungus CC Aspergillus terreus. CC -!- The overall reaction comprises a single condensation reaction CC followed by alpha-methylation, beta-ketoreduction, dehydration, CC and alpha,beta enoyl reduction. DR Q9Y7D5, LOVF_ASPTE ; Q0C8L6, LOVF_ASPTN ; Q8J0F5, MLCB_PENCI ; DR Q3S2U6, MOKB_MONPI ; //