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- W2068432935 abstract "Azide is bound to the cambialistic Fe-SOD (SOD = superoxide dismutase) of Propionibacterium shermanii in the range pH 6 up to pH 9.5. We describe experiments at pH 6.15 and pH 7.8. At low ionic strength all the iron centres are complexed by azide. The symmetry of the coordination sphere of the iron is hexacoordinated approximately octahedrally. The electron paramagnetic resonance (EPR) and Mössbauer spectra can be described within this symmetry by a consistent set of crystal field parameters of only one iron species. The models of the azide coordinated SOD from extended X-ray absorption fine structure (EXAFS) at high pH and the X-ray structure analysis at low pH are compatible. At pH 6.15 the SOD is pentacoordinated. If azide is added it occupies the sixth coordination site. At pH 7.8 the SOD is partly hexacoordinated with an H2O or an OH−. Azide replaces this solvent molecule and occupies this position in addition in the pentacoordinated molecules. The decrease in the activity is explained by a competitive inhibition by the molecule at the sixth coordination site. This work shows that in the presence of azide the central iron of the SOD is hexacoordinated in the entire pH range." @default.
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- W2068432935 title "The structure of the azide coordinated superoxide dismutase of Propionibacterium shermanii investigated by X-ray structure analysis, extended X-ray absorption fine structure, Mössbauer and electron paramagnetic resonance spectroscopy" @default.
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- W2068432935 doi "https://doi.org/10.1016/s0020-1693(97)06061-1" @default.
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