Ferredoxins advantage over rubredoxins

The advantage of ferredoxins over rubredoxins in terms of redox chemistry is that by combining several Fe centres in close proximity, it is possible to access a greater range of reduction potentials. Different conformations of the protein pockets which surround the Fe S clusters affect the detailed structural features of the cluster cores and, thus, their reduction potentials, e.g. —420 mV for spinach [2Fe-2S] ferredoxin, and —270 mV for adrenal [2Fe-2S] ferredoxin. A [2Fe-2S] ferredoxin acts as a one-electron transfer centre, going from an Fe(II)/Fe(II) state in the reduced form to an Fe(II)/Fe(III) state when oxidized and vice versa. Evidence for the localized, mixed valence species comes from EPR spectroscopic data. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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