Abstract
FERRITIN is the presumed iron storage protein of mammalian1, plant2 and certain fungal3 systems. The nitrogen-fixing bacterium Azotobacter vinelandii, produces a b-type cytochrome containing large amounts of non-haem iron and no labile sulphide, as first shown by Bulen et al.4. Here we present evidence which reveals this protein to be a ferritin-like species, thus constituting the first authenticated occurrence of ferritin in a bacterium. The interesting redox properties of this molecule, bacterioferritin-cytochrome, are presented and discussed.
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