5.3.1.15	Ca2+	metal ion required, Ca2+ activates slightly	2638, 2639	
5.3.1.15	Ca2+	the addition of Ca2+ ion to EDTA-treated enzyme enhances the activity of D-lyxose isomerization	716074	
5.3.1.15	Co2+	1 mM, 9.1fold activation	749201	
5.3.1.15	Co2+	about 40% activity in the presence of 1 mM Co2+ as compared to Mn2+	713845	
5.3.1.15	Co2+	activating at 1 mM, D-xylose as substrate	674319	
5.3.1.15	Co2+	maximum activity (6.6fold) in the presence of 0.5 mM Co2+	727225	
5.3.1.15	Co2+	metal ion required, Co2+ activates slightly	2638, 2639	
5.3.1.15	Fe2+	1 mM, 2.1fold activation	749201	
5.3.1.15	Fe2+	metal ion required, Fe2+ activates	2638, 2639	
5.3.1.15	Fe3+	metal ion required, Fe3+ activates	2638, 2639