1.13.11.27	Ca2+	66.5% of the activity with Fe2+	764952	
1.13.11.27	copper	0.4 atoms of Fe per 89000 Da enzyme. Removal of copper does not correlate with loss of activity	395367, 395377	
1.13.11.27	copper	variable amounts of copper: 0.2-0.5 mol per mol of enzyme	395384	
1.13.11.27	Fe	Fe(II), Fe(III), and Fe(IV) during oxygenation and hydroxylation, overview. The iron ion is coordinated by a His-His-Glu triad, structure of HPPD-Fe(II)-acetate complex, overview	742742	
1.13.11.27	Fe2+	-	701453, 702737, 705631	
1.13.11.27	Fe2+	a Fe(II)-dependent dioxygenase, Fe2+ is involved in the catalytic mechanism binding to the substrate, overview	724392	
1.13.11.27	Fe2+	a Fe(II)-dependent non-heme oxygenase	742068	
1.13.11.27	Fe2+	an iron-dependent, nonheme oxygenase enzyme	743564	
1.13.11.27	Fe2+	essential role for enzyme bound zinc	395384	
1.13.11.27	Fe2+	essential role for enzyme-bound Fe2+ in catalytic process	395369