3.6.1.17	Ca2+	activated by physiological concentration, maximal activity at 2 mM	657213	
3.6.1.17	Ca2+	no activity in the presence of 1.0 and 5.0 mM Ca2+	695301	
3.6.1.17	Cd2+	no activity in the presence of 1.0 mM Cd2+, weak enzyme activation at 5 mM (4.% compared to 1.5 mM Mn2+)	695301	
3.6.1.17	Co2+	5 mM, 42% of the activity with Mg2+	733450	
3.6.1.17	Co2+	60% of activity	209908	
3.6.1.17	Co2+	about 50% of the activity with Mn2+. In the presence of Mn2+, PrpA hydrolyzes P1,P3-bis(5'-adenosyl)tetraphosphate mainly into AMP and ATP, whereas in the presence of Co2+, PrpA hydrolyzes P1,P3-bis(5'-adenosyl)tetraphosphate into two molecules of ADP, reaction of EC 3.6.1.17	733872	
3.6.1.17	Co2+	divalent cation required, 20% of maximal activity in presence of 1 mM Co2+	654817	
3.6.1.17	Co2+	the enzyme is dependent on divalent cations	687119	
3.6.1.17	Co2+	weak stimulation	209911	
3.6.1.17	Mg2+	-	209909