Oxygen activation at mononuclear nonheme iron centers: a superoxo perspective.
Oxygen activation at mononuclear nonheme iron centers: a superoxo perspective.
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DOI:
10.1021/ic901891n
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发表时间:
2010-04-19
影响因子:
4.6
通讯作者:
Que, Lawrence, Jr.
中科院分区:
文献类型:
--
作者:
Mukherjee, Anusree;Cranswick, Matthew A.;Chakrabarti, Mrinmoy;Paine, Tapan K.;Fujisawa, Kiyoshi;Muenck, Eckard;Que, Lawrence, Jr.
Dioxygen activation by iron enzymes is responsible for many metabolically important transformations in biology. Often a high-valent iron-oxo oxidant is proposed to form upon dioxygen activation at a mononuclear nonheme iron center, presumably via intervening iron-superoxo and iron-peroxo species. While iron(IV)-oxo intermediates have been trapped and characterized in enzymes and models, less is known of the putative iron(III)-superoxo species. Utilizing a synthetic model for the 2-oxoglutarate-dependent monoiron enzymes, [(TpiPr2)FeII(O2CC(O)CH3)], we have obtained indirect evidence for the formation of the putative iron(III)-superoxo species, which can undergo one-electron reduction, hydrogen-atom transfer, or conversion to an iron(IV)-oxo species, depending on the reaction conditions. These results demonstrate the various roles the iron(III)-superoxo species can play in the course of dioxygen activation at a nonheme iron center.
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