2.2.1.6	Al3+	activates	700782	
2.2.1.6	Ba2+	activates	700782	
2.2.1.6	Ca2+	activates	700782, 733685	
2.2.1.6	Ca2+	stimulates	395898	
2.2.1.6	Cd2+	activates	700782, 733685	
2.2.1.6	Co2+	activates	700782	
2.2.1.6	K+	mutant D428N, Km-value 19 mM, mutant D428E, Km-value 35 mM	657912	
2.2.1.6	KCl	maximal activity required KCl concentrations of greater than 3.5 M	727336	
2.2.1.6	Mg2+	-	395898, 667251, 672568, 672868, 695852, 697349, 697972, 699740	
2.2.1.6	Mg2+	0.5 mM used in assay conditions	757919