1.5.99.4	Cu2+	inhibitory	392538	
1.5.99.4	Fe2+	-	392543	
1.5.99.4	Fe2+	four iron groups per mol	391423, 392537	
1.5.99.4	Fe2+	the enzyme contains a [2Fe-2S]-center	741698	
1.5.99.4	Iron	subunit B carries an iron-sulfur cluster	392431	
1.5.99.4	Molybdenum	enzyme synthesis responds to the presence of this metal ion	392430	
1.5.99.4	Molybdenum	one molecule per mol	391423, 392537	
1.5.99.4	Molybdenum	subunit C contains a molybdopterin-binding domain	392431	
1.5.99.4	additional information	two labile sulfur groups per mol	391423, 392537	
1.5.99.4	Tungsten	enzyme synthesis responds to the presence of this metal ion	392430