1.2.1.57	4-hydroxybutanoyl-CoA + NADH + H+	-	
1.2.1.57	4-hydroxybutanoyl-CoA + NADPH + H+	-	
1.2.1.57	acetyl-CoA + NADH + H+	-	
1.2.1.57	acetyl-CoA + NADH + H+	low activity	
1.2.1.57	butanoyl-CoA + NADH + H+	-	
1.2.1.57	butanoyl-CoA + NADH + H+	best substrate	
1.2.1.57	butanoyl-CoA + NADPH + H+	-