Ferroxidase Activity in Eukaryotic Ferritin is Controlled by Accessory-Iron-Binding Sites in the Catalytic Cavity.
Bernacchioni, C., Pozzi, C., Di Pisa, F., Mangani, S., Turano, P.(2016) Chemistry 22: 16213-16219
- PubMed: 27650996 
- DOI: https://doi.org/10.1002/chem.201602842
- Primary Citation of Related Structures:  
5J8S, 5J8W, 5J93, 5J9V, 5JAC - PubMed Abstract: 
Ferritins are iron-storage nanocage proteins that catalyze the oxidation of Fe 2+ to Fe 3+ at ferroxidase sites. By a combination of structural and spectroscopic techniques, Asp140, together with previously identified Glu57 and Glu136, is demonstrated to be an essential residue to promote the iron oxidation at the ferroxidase site. However, the presence of these three carboxylate moieties in close proximity to the catalytic centers is not essential to achieve binding of the Fe 2+ substrate to the diferric ferroxidase sites with the same coordination geometries as in the wild-type cages.
Organizational Affiliation: 
CERM and Department of Chemistry, University of Florence, Via Sacconi 6 Sesto Fiorentino, Firenze, 50019, Italy.