3.4.11.13	Cd2+	-	81194, 81195, 81196, 81197	
3.4.11.13	Co2+	-	81197	
3.4.11.13	Co2+	activates to a lesser extent than Mn2+, no activity in absence of metal ions	665095	
3.4.11.13	Co2+	optiumum concentration 0.025 mM	81195, 81196	
3.4.11.13	Co2+	required, 0.93-1.25 mol cobalt per mol enzyme, optimal concentration 0.003-0.018 mM, involved in enzyme-substrate binding, inhibitory above 3-7 mM, time-course of activation	81193	
3.4.11.13	Mn2+	-	81197	
3.4.11.13	Mn2+	activates, no activity in absence of metal ions	665095	
3.4.11.13	Mn2+	best activator, optimum concentration 0.05 mM	81195, 81196	
3.4.11.13	Mn2+	required	81193	
3.4.11.13	Ni2+	-	81194, 81195, 81196, 81197