Structure and electrochemistry of proteins harboring iron-sulfur clusters of different nuclearities. Part III. [4Fe-4S], [3Fe-4S] and [2Fe-2S] iron-sulfur proteins.

A systematic rationalization of the hundreds of proteins harboring iron-sulfur clusters and able to exhibit the most diverse biological functions is missing. In this picture we have already reviewed structure/electrochemistry of metalloproteins expressing single types of iron-sulfur centres [namely, {Fe(Cys)4 }, {[Fe2 S2 ](Cys)4 }, {[Fe2 S2 ](Cys)3 (X)} (X = Asp, Arg, His), {[Fe2 S2 ](Cys)2 (His)2 }, {[Fe3 S4 ](Cys)3 }, {[Fe4 S4 ](Cys)4 } and {[Fe4 S4 ](Sγ Cys )3 (nonthiolate ligand)}] and their synthetic analogs. Recently we are focussing on structure/electrochemistry of metalloproteins containing iron-sulfur centres of different nuclearities. Having started such a subject with proteins harboring [4Fe-4S] and [2Fe-2S] (Zanello, 2017c) as well as [4Fe-4S] and [3Fe-4S] (Zanello, in press) clusters, we now provide the state of art of proteins harboring [4Fe-4S], [3Fe-4S] and [2Fe-2S] clusters, a subject that resulted strictly limited to enzymes active in the respiratory Complex II.