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- W2158209511 abstract "The all-ferrous Rieske cluster, [2Fe-2S] 0 , has been produced in solution and characterized by protein-film voltammetry and UV–visible, EPR, and Mössbauer spectroscopies. The [2Fe-2S] 0 cluster, in the overexpressed soluble domain of the Rieske protein from the bovine cytochrome bc 1 complex, is formed at –0.73 V at pH 7. Therefore, at pH 7, the [2Fe-2S] 1+/0 couple is 1.0 V below the [2Fe-2S] 2+/1+ couple. The two cluster-bound ferrous irons are both high spin (S = 2), and they are coupled antiferromagnetically (– J ≥ 30 cm –1 , H =–2 J S1·S2) to give a diamagnetic (S = 0) ground state. The ability of the Rieske cluster to exist in three oxidation states (2+, 1+, and 0) without an accompanying coupled reaction, such as a conformational change or protonation, is highly unusual. However, uncoupled reduction to the [2Fe-2S] 0 state occurs at pH > 9.8 only, and at high pH the intact cluster persists in solution for <1 min. At pH < 9.8, the all-ferrous cluster is stabilized significantly by protonation. A combination of experimental data and calculations based on density functional theory suggests strongly that the proton binds to one of the cluster μ 2 -sulfides, consistent with observations that reduced [3Fe-4S] clusters are protonated also. The implications for our understanding of coupled reactions at iron–sulfur clusters and of the factors that determine the relative stabilities of their different oxidation states are discussed." @default.
- W2158209511 created "2016-06-24" @default.
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- W2158209511 date "2004-07-19" @default.
- W2158209511 modified "2023-10-03" @default.
- W2158209511 title "Formation and characterization of an all-ferrous Rieske cluster and stabilization of the [2Fe-2S] <sup>0</sup> core by protonation" @default.
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- W2158209511 doi "https://doi.org/10.1073/pnas.0402711101" @default.
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