1.3.1.109	(E)-but-2-enoyl-CoA + 2 NADH + 2 oxidized ferredoxin iron-sulfur cluster	
1.3.1.109	(E)-but-2-enoyl-CoA + NADH + oxidized ferredoxin [iron-sulfur] cluster	
1.3.1.109	butanoyl-CoA + 2 NAD+ + 2 reduced ferredoxin [iron-sulfur] cluster