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- W4255352676 abstract "Abstract Superoxide reductase (SOR) is a small bacterial metalloprotein, which is present in the cytoplasm of some anaerobic or microaerophilic microorganisms. SOR is involved in the detoxification of the superoxide radical and catalyzes its one‐electron reduction into hydrogen peroxide. Three different classes of SOR have been identified and structurally characterized. They all contain a similar active site, which consists of an unusual nonheme iron center, coordinated in a square‐pyramidal geometry to four nitrogens from four histidine side chains in the equatorial plane and the sulfur of one cysteine residue along the fifth axial position. In the reduced state, the sixth axial coordinating site of the iron is vacant, suggesting the most obvious site for initial binding of the superoxide substrate. The reaction mechanism of SOR has been studied by pulse radiolysis. SOR reacts specifically at a nearly diffusion‐controlled rate with O 2 •− , generating H 2 O 2 and the oxidized Fe 3+ active site. Reaction intermediates have been observed and proposed to be Fe 3+ ‐(hydro)peroxo species, resulting from the fast electron transfer from the ferrous iron to the superoxide anion and from protonation step. Formation of Fe 3+ ‐(hydro)peroxo intermediate species in the active site of SOR has been supported by resonance Raman spectroscopy and X‐ray structures of iron(III) peroxide species in the SOR from Desulfoarculus baarsii ." @default.
- W4255352676 created "2022-05-12" @default.
- W4255352676 creator A5010878167 @default.
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- W4255352676 date "2011-12-15" @default.
- W4255352676 modified "2023-10-16" @default.
- W4255352676 title "Superoxide Reductase" @default.
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- W4255352676 doi "https://doi.org/10.1002/9781119951438.eibc0691" @default.
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