1.1.1.4	(2R,3R)-butane-2,3-diol + NAD+	preferred substrate	
1.1.1.4	(2R,3R)-butane-2,3-diol + NAD+	Paenibacillus polymyxa ATCC 12321 has the ability to form almost exclusively the R isomer of 2,3-BDL (over 98%) when grown under anaerobic conditions	
1.1.1.4	(2R,3R)-butane-2,3-diol + NAD+	-	
1.1.1.4	(2R,3S)-butane-2,3-diol + NAD+	-	
1.1.1.4	(2S)-acetoin + NADH + H+	the enzyme is not absolutely specific for (S)-acetoin, though this is the preferred substrate	
1.1.1.4	(2S,3S)-butane-2,3-diol + NAD+	-	
1.1.1.4	(R)-acetoin + NADH + H+	-	
1.1.1.4	(R)-acetoin + NADH + H+	 the activity of (R)-acetoin reduction is 7.7times higher than that of (2R,3R)-butane-2,3-diol oxidation at pH 7.0	
1.1.1.4	(R)-acetoin + NADH + H+	high level production of (R,R)-butane-2,3-diol	
1.1.1.4	(R,R)-butane-2,3-diol + NAD+	-