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AbstractRubrerythrin (Rr) is the trivial name given to a non-heme iron protein of unknown function which has been found in anaerobic sulfate-reducing bacteria. Rr is unique in containing both rubredoxin-type FeS4 and diiron-oxo sites in the same protein. The results described here demonstrate for the recombinant protein that: (a) Rr catalyzes oxidation of Fe2+ to Fe3+ by O2, i.e., Rr has ferroxidase...