3.5.4.16	Fe2+	dependent, contains 1 Fe2+ per protomer	685163	
3.5.4.16	K+	activates	209550, 209564	
3.5.4.16	Li+	activates	209550	
3.5.4.16	Mg2+	activates	209546, 209566	
3.5.4.16	Mn2+	at 2 mM Mn2+ is able to restore MptA activity to a higher level than Fe2+, Mn2+ enzyme is not inactivated by exposure to oxygen	685163	
3.5.4.16	Mn2+	required for activity of isozyme GCYH-1B	712290	
3.5.4.16	additional information	no metals required	209552, 209553	
3.5.4.16	Na+	activates	209550	
3.5.4.16	Zn2+	1 ion per active site	656261	
3.5.4.16	Zn2+	absolutely required, e.g. for activity and reconstitution of the denatured enzyme, 1 Zn2+ bound per subunit of the decameric enzyme	655489