5.3.1.8	Ba2+	activates	701797	
5.3.1.8	Ca2+	-	2827	
5.3.1.8	Ca2+	2 mM, maximum activity	733811	
5.3.1.8	Ca2+	activates	2824, 701472, 701797, 702817, 702869	
5.3.1.8	Ca2+	best activator, may be replaced by Mg2+ or Mn2+ for phosphomannose isomerase activity	671785	
5.3.1.8	Ca2+	divalent ions are necessary for PMI maximal activity in decreasing order of activation: Ca2+, Mn2+, Mg2+, Co2+, Ni2+	746961	
5.3.1.8	Ca2+	the enzyme is not stimulated by Ca2+	714372	
5.3.1.8	Co2+	-	701812	
5.3.1.8	Co2+	2 mM, about 80% of the activity with Cu2+	733811	
5.3.1.8	Co2+	about 230% activity at 0.5 mM	713854, 714372