4.2.3.12	Ba2+	stimulatory effect, 5 mM greatly accelerates activity	648561	
4.2.3.12	Ca2+	65% of the activity with equal concentration of Mg2+	648564	
4.2.3.12	Ca2+	less than 15% of activity with Mg2+ with 5 mM	648554	
4.2.3.12	Ca2+	stimulatory effect and additive effect at Mg2+, 1 mM	648561	
4.2.3.12	Co2+	free metal enzyme activity reaches 60% of activity of wild type with 0.50 mM and concentrations higher than 0.15 mM completely inactivates the enzyme. Less than 15% of activity with Mg2+ with 5 mM	648554	
4.2.3.12	Mg2+	75% enhancement	716147	
4.2.3.12	Mg2+	free metal enzyme activity is 15% of the wild type with 8 mM, it is not bound to the enzyme	648554	
4.2.3.12	Mg2+	necessary for activity	648555, 648559	
4.2.3.12	Mg2+	optimum concentration is 8 mM	648564	
4.2.3.12	Mg2+	required	648553, 648555