ID 1.3.1.52 DE 2-methyl-branched-chain-enoyl-CoA reductase. CA 2-methylbutanoyl-CoA + NAD(+) = 2-methylcrotonoyl-CoA + NADH. CF FAD. CC -!- From Ascaris suum. CC -!- The reaction proceeds only in the presence of another flavoprotein CC ('electron-transferring flavoprotein'). //