1.17.4.2	Ca2+	-	437897	
1.17.4.2	Ca2+	absolutely dependent on	437893	
1.17.4.2	Ca2+	markedly stimulates activity	437895	
1.17.4.2	Co2+	class II enzymes contain cobalamin as cofactor	715085	
1.17.4.2	Co2+	enzyme requires adenosylcobalamin as a cofactor, the Co ion is involved in the reaction	714185	
1.17.4.2	Cs+	activating effect	437892	
1.17.4.2	Fe2+	the class III enzymes contain 4Fe-4S clusters in the small beta-subunit	715085	
1.17.4.2	K+	activating effect	437892	
1.17.4.2	Li+	activating effect	437892	
1.17.4.2	Mg2+	-	437891, 437897	
1.17.4.2	Mg2+	can stimulate the reaction	437891	
1.17.4.2	Mg2+	markedly stimulates activity	437895	
1.17.4.2	Mg2+	required	681889	
1.17.4.2	Mg2+	stabilized by	437893	
1.17.4.2	Mg2+	stimulates enzyme activity	437889	
1.17.4.2	Mn2+	stimulates enzyme activity	437889	
1.17.4.2	Na+	activating effect	437892	
1.17.4.2	NH4+	activating effect	437892	
1.17.4.2	Rb+	activating effect	437892