6.2.1.22	Mg2+	optimal Mg2+ concentration: 1.6-1.9 mM	
6.2.1.22	Mg2+	required, optimal concentration: 3 mM, inhibitory above 5 mM	
6.2.1.22	Mg2+	not required, Km: 1.6 mM	
6.2.1.22	PO43-	activity is modulated by phosphorylation/dephosphorylation, active form of enzyme is phosphorylated