ID   1.3.1.109
DE   butanoyl-CoA dehydrogenase complex (NAD(+), ferredoxin).
AN   bifurcating butanoyl-CoA dehydrogenase.
AN   butanoyl-CoA dehydrogenase/Etf complex.
CA   butanoyl-CoA + 2 NAD(+) + 2 reduced [2Fe-2S]-[ferredoxin] = (2E)-
CA   butenoyl-CoA + 2 NADH + 2 oxidized [2Fe-2S]-[ferredoxin].
CC   -!- The enzyme is a complex of a flavin-containing dehydrogenase
CC       component (Bcd) and an electron-transfer flavoprotein dimer (EtfAB).
CC   -!- The enzyme complex, isolated from the bacteria Acidaminococcus
CC       fermentans and butanoate-producing Clostridia species, couples the
CC       exergonic reduction of (E)-but-2-enoyl-CoA to butanoyl-CoA by NADH to
CC       the endergonic reduction of ferredoxin by NADH, using electron
CC       bifurcation to overcome the steep energy barrier in ferredoxin
CC       reduction.
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