Catalytic iron(II) oxidation in the non-haem ferritin of Escherichia coli: the early intermediate is not an iron tyrosinate*

The non-haem ferritin of Escherichia coli (EcFTN) has been shown to give a blue complex during iron(II) oxidation, the colour being enhanced by amino acid substitutions near the diiron site; this intermediate is not a tyrosine→iron charge-transfer complex.