1.3.99.16	iron-sulfur centre	two distinct 2Fe-2S clusters	
1.3.99.16	molybdopterin cytosine dinucleotide	-	
1.3.99.16	additional information	enzyme contains no FAD	
1.3.99.16	Pterin molybdenum cofactor	-	
1.3.99.16	Pterin molybdenum cofactor	the enzyme contains a pterin molybdenum cofactor with a monooxo-monosulfido-type molybdenum center